Reason for revert: Breaks Chromium build. Need to remove the references to the obsolete header files from Chromium and reland. Original issue's description: > Delete empty API files and cleaned up includes. > > TBR=glaznev@webrtc.org > > BUG=webrtc:5426 > > Committed: https://crrev.com/c9022f508644dc33c01b05cb22ebfc2be145d6b2 > Cr-Commit-Position: refs/heads/master@{#12039} TBR=nisse@webrtc.org,glaznev@webrtc.org,perkj@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:5426 Review URL: https://codereview.webrtc.org/1813083002 Cr-Commit-Position: refs/heads/master@{#12042}