Revert of Support adding and removing MediaRecorder to camera 2 session. (patchset #5 id:80001 of https://codereview.webrtc.org/2833773003/ )

Reason for revert:
Breaks external bot

Original issue's description:
> Support adding and removing MediaRecorder to camera 2 session.
>
> Camera 1 API is not supported.
>
> BUG=b/36684011
>
> Review-Url: https://codereview.webrtc.org/2833773003
> Cr-Commit-Position: refs/heads/master@{#17901}
> Committed: https://chromium.googlesource.com/external/webrtc/+/2fc04769faec0031a202963eaeb602420a082c07

TBR=sakal@webrtc.org,glaznev@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=b/36684011

Review-Url: https://codereview.webrtc.org/2844233002
Cr-Original-Commit-Position: refs/heads/master@{#17905}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6702739862e292f3556a9e63c71367f49c3895b4
7 files changed