diff --git a/webrtc/examples/BUILD.gn b/webrtc/examples/BUILD.gn
index 10deaf27c4..d8e2545816 100644
--- a/webrtc/examples/BUILD.gn
+++ b/webrtc/examples/BUILD.gn
@@ -160,7 +160,6 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
       "objc/AppRTCMobile/common/ARDUtilities.h",
       "objc/AppRTCMobile/common/ARDUtilities.m",
     ]
-    configs += [ "//build/config/compiler:enable_arc" ]
     public_configs = [ ":apprtc_common_config" ]
 
     deps = [
@@ -227,7 +226,6 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
       "objc/AppRTCMobile/RTCSessionDescription+JSON.h",
       "objc/AppRTCMobile/RTCSessionDescription+JSON.m",
     ]
-    configs += [ "//build/config/compiler:enable_arc" ]
     public_configs = [ ":apprtc_signaling_config" ]
     deps = [
       ":apprtc_common",
@@ -260,7 +258,6 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
         "objc/AppRTCMobile/ios/UIImage+ARDUtilities.h",
         "objc/AppRTCMobile/ios/UIImage+ARDUtilities.m",
       ]
-      configs += [ "//build/config/compiler:enable_arc" ]
 
       deps = [
         ":apprtc_common",
@@ -337,10 +334,7 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
         "objc/AppRTCMobile/mac/APPRTCViewController.h",
         "objc/AppRTCMobile/mac/APPRTCViewController.m",
       ]
-      configs += [
-        "//webrtc:common_objc",
-        "//build/config/compiler:enable_arc",
-      ]
+      configs += [ "//webrtc:common_objc" ]
       deps = [
         ":apprtc_common",
         ":apprtc_signaling",
@@ -394,10 +388,7 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
       "objc/AppRTCMobile/third_party/SocketRocket/SRWebSocket.h",
       "objc/AppRTCMobile/third_party/SocketRocket/SRWebSocket.m",
     ]
-    configs += [
-      "//build/config/compiler:enable_arc",
-      ":socketrocket_warning_config",
-    ]
+    configs += [ ":socketrocket_warning_config" ]
     public_configs = [ ":socketrocket_include_config" ]
 
     libs = [
@@ -430,7 +421,6 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
           "//build/config/ios:xctest",
           "//third_party/ocmock",
         ]
-        configs += [ "//build/config/compiler:enable_arc" ]
       }
 
       rtc_ios_xctest_test("apprtcmobile_tests") {
diff --git a/webrtc/modules/audio_device/BUILD.gn b/webrtc/modules/audio_device/BUILD.gn
index 3fa06b5139..fcf445e6eb 100644
--- a/webrtc/modules/audio_device/BUILD.gn
+++ b/webrtc/modules/audio_device/BUILD.gn
@@ -192,8 +192,6 @@ rtc_static_library("audio_device") {
           "ios/voice_processing_audio_unit.h",
           "ios/voice_processing_audio_unit.mm",
         ]
-        configs += [ "//build/config/compiler:enable_arc" ]
-
         libs = [
           "AudioToolbox.framework",
           "AVFoundation.framework",
@@ -291,7 +289,6 @@ if (rtc_include_tests) {
     }
     if (is_ios) {
       sources += [ "ios/objc/RTCAudioSessionTest.mm" ]
-      configs += [ "//build/config/compiler:enable_arc" ]
       if (target_cpu != "x64") {
         sources += [ "ios/audio_device_unittest_ios.cc" ]
       }
diff --git a/webrtc/modules/desktop_capture/mouse_cursor_monitor_mac.mm b/webrtc/modules/desktop_capture/mouse_cursor_monitor_mac.mm
index 213071952b..73d5e02857 100644
--- a/webrtc/modules/desktop_capture/mouse_cursor_monitor_mac.mm
+++ b/webrtc/modules/desktop_capture/mouse_cursor_monitor_mac.mm
@@ -36,7 +36,7 @@ namespace {
 // setting.
 NSImage* PaintInCurrentContext(NSImage* source) {
   NSSize size = [source size];
-  NSImage* new_image = [[[NSImage alloc] initWithSize:size] autorelease];
+  NSImage* new_image = [[NSImage alloc] initWithSize:size];
   [new_image lockFocus];
   NSRect frame = NSMakeRect(0, 0, size.width, size.height);
   [source drawInRect:frame
diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index 38c5b68de6..c27811a86f 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -31,10 +31,7 @@ if (is_ios || is_mac) {
     deps = [
       "../base:rtc_base",
     ]
-    configs += [
-      "..:common_objc",
-      "//build/config/compiler:enable_arc",
-    ]
+    configs += [ "..:common_objc" ]
     public_configs = [ ":rtc_sdk_common_objc_config" ]
     sources = [
       "objc/Framework/Classes/NSString+StdString.h",
@@ -230,10 +227,7 @@ if (is_ios || is_mac) {
       ]
     }
 
-    configs += [
-      "..:common_objc",
-      "//build/config/compiler:enable_arc",
-    ]
+    configs += [ "..:common_objc" ]
 
     public_configs = [ ":rtc_sdk_common_objc_config" ]
 
@@ -373,10 +367,7 @@ if (is_ios || is_mac) {
         "VideoToolbox.framework",
       ]
 
-      configs += [
-        "..:common_objc",
-        "//build/config/compiler:enable_arc",
-      ]
+      configs += [ "..:common_objc" ]
 
       public_configs = [ ":rtc_sdk_common_objc_config" ]
 
@@ -406,10 +397,7 @@ if (is_ios || is_mac) {
       "objc/Framework/Classes/h264_video_toolbox_nalu.h",
     ]
 
-    configs += [
-      "//webrtc:common_objc",
-      "//build/config/compiler:enable_arc",
-    ]
+    configs += [ "//webrtc:common_objc" ]
 
     deps = [
       ":rtc_sdk_common_objc",
diff --git a/webrtc/sdk/objc/Framework/UnitTests/avformatmappertests.mm b/webrtc/sdk/objc/Framework/UnitTests/avformatmappertests.mm
index 624eec3d6c..cbc2e50df5 100644
--- a/webrtc/sdk/objc/Framework/UnitTests/avformatmappertests.mm
+++ b/webrtc/sdk/objc/Framework/UnitTests/avformatmappertests.mm
@@ -97,7 +97,6 @@ static cricket::VideoFormat expectedFormat =
     CFRelease(_format);
     _format = nil;
   }
-  [super dealloc];
 }
 
 // Redefinition of AVCaptureDevice methods we want to mock.
diff --git a/webrtc/test/BUILD.gn b/webrtc/test/BUILD.gn
index 64b6e03919..e76ff03b6c 100644
--- a/webrtc/test/BUILD.gn
+++ b/webrtc/test/BUILD.gn
@@ -128,7 +128,6 @@ rtc_source_set("fileutils") {
   ]
   if (is_ios) {
     sources += [ "testsupport/iosfileutils.mm" ]
-    configs += [ "//build/config/compiler:enable_arc" ]
   }
   visibility = [ ":*" ]
   deps = [
diff --git a/webrtc/test/mac/run_test.mm b/webrtc/test/mac/run_test.mm
index 4e0093a9b6..d6df69c46a 100644
--- a/webrtc/test/mac/run_test.mm
+++ b/webrtc/test/mac/run_test.mm
@@ -36,10 +36,10 @@ TestBlock functionToBlock(void(*function)()) {
 }
 
 - (void)runAllTests:(TestBlock)testBlock {
-  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
-  testBlock();
-  running_ = NO;
-  [pool release];
+  @autoreleasepool {
+    testBlock();
+    running_ = NO;
+  }
 }
 
 - (BOOL)running {
@@ -51,24 +51,23 @@ namespace webrtc {
 namespace test {
 
 void RunTest(void(*test)()) {
-  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
-  [NSApplication sharedApplication];
+  @autoreleasepool {
+    [NSApplication sharedApplication];
 
-  // Convert the function pointer to an Objective-C block and call on a
-  // separate thread, to avoid blocking the main thread.
-  TestRunner *testRunner = [[TestRunner alloc] init];
-  TestBlock testBlock = functionToBlock(test);
-  [NSThread detachNewThreadSelector:@selector(runAllTests:)
-                           toTarget:testRunner
-                         withObject:testBlock];
+    // Convert the function pointer to an Objective-C block and call on a
+    // separate thread, to avoid blocking the main thread.
+    TestRunner *testRunner = [[TestRunner alloc] init];
+    TestBlock testBlock = functionToBlock(test);
+    [NSThread detachNewThreadSelector:@selector(runAllTests:)
+                             toTarget:testRunner
+                           withObject:testBlock];
 
-  NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
-  while ([testRunner running] &&
-         [runLoop runMode:NSDefaultRunLoopMode
-               beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]]);
+    NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
+    while ([testRunner running] &&
+           [runLoop runMode:NSDefaultRunLoopMode
+                 beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]]);
+  }
 
-  [testRunner release];
-  [pool release];
 }
 
 }  // namespace test
diff --git a/webrtc/test/mac/video_renderer_mac.mm b/webrtc/test/mac/video_renderer_mac.mm
index f79aecf916..ee1f9060ad 100644
--- a/webrtc/test/mac/video_renderer_mac.mm
+++ b/webrtc/test/mac/video_renderer_mac.mm
@@ -43,11 +43,6 @@
   return self;
 }
 
-- (void)dealloc {
-  [window_ release];
-  [super dealloc];
-}
-
 - (void)createWindow:(NSObject *)ignored {
   NSInteger xOrigin = nextXOrigin_;
   NSRect screenFrame = [[NSScreen mainScreen] frame];
@@ -71,8 +66,8 @@
                                             defer:NO];
 
   NSRect viewFrame = NSMakeRect(0, 0, width_, height_);
-  NSOpenGLView *view = [[[NSOpenGLView alloc] initWithFrame:viewFrame
-                                                pixelFormat:nil] autorelease];
+  NSOpenGLView *view = [[NSOpenGLView alloc] initWithFrame:viewFrame
+                                                pixelFormat:nil];
   context_ = [view openGLContext];
 
   [[window_ contentView] addSubview:view];
@@ -105,7 +100,6 @@ MacRenderer::MacRenderer()
 
 MacRenderer::~MacRenderer() {
   GlRenderer::Destroy();
-  [window_ release];
 }
 
 bool MacRenderer::Init(const char* window_title, int width, int height) {
diff --git a/webrtc/webrtc.gni b/webrtc/webrtc.gni
index 6f902c97bf..e47ac08afc 100644
--- a/webrtc/webrtc.gni
+++ b/webrtc/webrtc.gni
@@ -211,6 +211,10 @@ webrtc_root = get_path_info(".", "abspath")
 # native code is built as part of Chromium.
 rtc_common_configs = [ webrtc_root + ":common_config" ]
 
+if (is_mac || is_ios) {
+  rtc_common_configs += [ "//build/config/compiler:enable_arc" ]
+}
+
 # Global public configuration that should be applied to all WebRTC targets. You
 # normally shouldn't need to include this in your target as it's automatically
 # included when using the rtc_* templates. It set the defines, include paths and