Reason for revert:
Dependant CL has been relanded
Original issue's description:
> Revert of Add unit tests for RTCMTLVideoView. (patchset #6 id:100001 of https://codereview.webrtc.org/2723903003/ )
>
> Reason for revert:
> This CL depends on a reverted CL.
>
> Original issue's description:
> > Add unit tests for RTCMTLVideoView.
> >
> > To properly test the functionality, following changes were needed
> > - Make RTCMTLVideoView compiliable for all cpu architectures not just arm64.
> > This is needed so that the test can run on any device and on simulator as well.
> > - Refactor RTCMTLVideoView to have mockable class methods.
> > The unittest class, RTCMTLVideoViewTests was designed to provide easy transition
> > to XCTest when the time comes for that.
> > To transition to XCTest it would suffice to inherit from XCTestCase and remove
> > the gtest methods.
> >
> > BUG=webrtc:7079
> >
> > Review-Url: https://codereview.webrtc.org/2723903003
> > Cr-Commit-Position: refs/heads/master@{#17014}
> > Committed: 0ebe0199ac
>
> TBR=magjed@webrtc.org,denicija@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:7079
>
> Review-Url: https://codereview.webrtc.org/2733953006
> Cr-Commit-Position: refs/heads/master@{#17118}
> Committed: 96d91524faTBR=magjed@webrtc.org,denicija@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7079
Review-Url: https://codereview.webrtc.org/2743663002
Cr-Commit-Position: refs/heads/master@{#17140}
954d9b943b