Reason for revert:
Breaks downstream import.
Original issue's description:
> Android: Make base interface for camera1 and camera2
>
> This CL adds a new interface CameraVideoCapturer that extends VideoCapturer with a switchCamera() function. It also moves moves CameraEventsHandler, CameraStatistics, and CameraSwitchHandler from VideoCapturerAndroid to this new interface. The purpose is to prepare for a camera2 implementation that will use the same interfaces and helper class.
>
> BUG=webrtc:5519
>
> Committed: https://crrev.com/6bdacaddfb18edef1f0cdd778209f6b05a8f9210
> Cr-Commit-Position: refs/heads/master@{#12723}
TBR=perkj@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5519
Review-Url: https://codereview.webrtc.org/1979583002
Cr-Commit-Position: refs/heads/master@{#12727}
181b5ffdf0