Revert of Add Metal video view in AppRTCMobile and metal availability macro.

Revert of Add Metal video view in AppRTCMobile and metal availability macro. (patchset #5 id:80001 of https://codereview.webrtc.org/2722583002/ )

Reason for revert:
Breaks AppRTCMobile

Original issue's description:
> Add Metal video view in AppRTCMobile and Metal availability macro.
> 
> - The RTC_SUPPORTS_METAL macro allows consumers to gracefully handle compilation for different archs that are not supporting Metal.
> 
> BUG=webrtc:7079
> 
> Review-Url: https://codereview.webrtc.org/2722583002
> Cr-Commit-Position: refs/heads/master@{#17004}
> Committed: https://chromium.googlesource.com/external/webrtc/+/154a7bb877abefada22afe28b0a755cf621e8d9e

TBR=magjed@webrtc.org,tkchin@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/2739793003
Cr-Commit-Position: refs/heads/master@{#17119}
Committed: https://chromium.googlesource.com/external/webrtc/+/cbbd8c76e8a8a1cf3f1193ea50980bc9d858458d

[kthelgason, 2017-03-08 13:51:51]

The CQ bit was checked by kthelgason@webrtc.org

[kthelgason, 2017-03-08 13:51:51]

Created Revert of Add Metal video view in AppRTCMobile and metal availability
macro.

[commit-bot: I haz the power, 2017-03-08 13:51:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-03-08 13:57:48]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-08 13:57:52]

Try jobs failed on following builders:
  ios32_sim_ios9_dbg on master.tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/ios32_sim_ios9_dbg/buil...)

[kthelgason, 2017-03-08 14:34:56]

The CQ bit was checked by kthelgason@webrtc.org

[commit-bot: I haz the power, 2017-03-08 14:35:08]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-03-08 14:54:59]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488983696160650, "parent_rev":
"96d91524fa66b9a2e4f9fbbbc9c5e5149021a3f0", "commit_rev":
"cbbd8c76e8a8a1cf3f1193ea50980bc9d858458d"}

[commit-bot: I haz the power, 2017-03-08 14:55:05]

Description was changed from

==========
Revert of Add Metal video view in AppRTCMobile and metal availability macro.
(patchset #5 id:80001 of https://codereview.webrtc.org/2722583002/ )

Reason for revert:
Breaks AppRTCMobile

Original issue's description:
> Add Metal video view in AppRTCMobile and Metal availability macro.
> 
> - The RTC_SUPPORTS_METAL macro allows consumers to gracefully handle
compilation for different archs that are not supporting Metal.
> 
> BUG=webrtc:7079
> 
> Review-Url: https://codereview.webrtc.org/2722583002
> Cr-Commit-Position: refs/heads/master@{#17004}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/154a7bb877abefada22afe28b...

TBR=magjed@webrtc.org,tkchin@webrtc.org,denicija@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:7079
==========

to

==========
Revert of Add Metal video view in AppRTCMobile and metal availability macro.
(patchset #5 id:80001 of https://codereview.webrtc.org/2722583002/ )

Reason for revert:
Breaks AppRTCMobile

Original issue's description:
> Add Metal video view in AppRTCMobile and Metal availability macro.
> 
> - The RTC_SUPPORTS_METAL macro allows consumers to gracefully handle
compilation for different archs that are not supporting Metal.
> 
> BUG=webrtc:7079
> 
> Review-Url: https://codereview.webrtc.org/2722583002
> Cr-Commit-Position: refs/heads/master@{#17004}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/154a7bb877abefada22afe28b...

TBR=magjed@webrtc.org,tkchin@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/2739793003
Cr-Commit-Position: refs/heads/master@{#17119}
Committed:
https://chromium.googlesource.com/external/webrtc/+/cbbd8c76e8a8a1cf3f1193ea5...
==========

[commit-bot: I haz the power, 2017-03-08 14:55:07]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/cbbd8c76e8a8a1cf3f1193ea5...

[kthelgason, 2017-03-09 09:35:04]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2742603003/ by kthelgason@webrtc.org.

The reason for reverting is: Fixing rendering issues in AppRTCMobile.