Reason for revert:
Downstream code has been updated.
Original issue's description:
> Revert of Android: Make base interface for camera1 and camera2 (patchset #3 id:80001 of https://codereview.webrtc.org/1895483002/ )
>
> 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
>
> Committed: https://crrev.com/181b5ffdf036427d92929667d9d43bbcff560435
> Cr-Commit-Position: refs/heads/master@{#12727}
TBR=perkj@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5519
Review-Url: https://codereview.webrtc.org/1994893002
Cr-Commit-Position: refs/heads/master@{#12807}
d269b023bf