Revert of Make rendering of MediaStreams reflect changes to its set of tracks.

Revert of Make rendering of MediaStreams reflect changes to its set of tracks. (patchset #6 id:120001 of https://codereview.chromium.org/2969093002/ )

Reason for revert:
Breaking build https://uberchromegw.corp.google.com/i/chromium.linux/builders/Cast%20Audio%20Linux/builds/3356

Original issue's description:
> Make rendering of MediaStreams reflect changes to its set of tracks.
> 
> Before this CL, MediaStreams assigned to a media element required
> reassignment of the stream to the element in order to make changes
> to the set of tracks visible.
> 
> This CL fixes this problem by making WebMediaPlayerMS subscribe to
> changes in the set of tracks of a MediaStream, and correspondingly
> update audio and video renderers.
> 
> BUG=720258
> 
> Review-Url: https://codereview.chromium.org/2969093002
> Cr-Commit-Position: refs/heads/master@{#490906}
> Committed: https://chromium.googlesource.com/chromium/src/+/c9612ba8bf66e48a32301e35425dd3384f48a3d8

TBR=dalecurtis@chromium.org,emircan@chromium.org,foolip@chromium.org,mkwst@chromium.org,guidou@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=720258
Review-Url: https://codereview.chromium.org/2985393002
Cr-Commit-Position: refs/heads/master@{#490920}
Committed: https://chromium.googlesource.com/chromium/src/+/b35b4c271b7819e3661942ab2c72083673722910

[jkrcal, 2017-08-01 08:54:35]

The CQ bit was checked by jkrcal@chromium.org

[jkrcal, 2017-08-01 08:54:35]

Created Revert of Make rendering of MediaStreams reflect changes to its set of
tracks.

[commit-bot: I haz the power, 2017-08-01 08:54:46]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-08-01 08:55:10]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1501577675369750, "parent_rev":
"eef8c4911b473f249e82ffe871b41c951e399449", "commit_rev":
"b35b4c271b7819e3661942ab2c72083673722910"}

[commit-bot: I haz the power, 2017-08-01 08:55:27]

Description was changed from

==========
Revert of Make rendering of MediaStreams reflect changes to its set of tracks.
(patchset #6 id:120001 of https://codereview.chromium.org/2969093002/ )

Reason for revert:
Breaking build
https://uberchromegw.corp.google.com/i/chromium.linux/builders/Cast%20Audio%2...

Original issue's description:
> Make rendering of MediaStreams reflect changes to its set of tracks.
> 
> Before this CL, MediaStreams assigned to a media element required
> reassignment of the stream to the element in order to make changes
> to the set of tracks visible.
> 
> This CL fixes this problem by making WebMediaPlayerMS subscribe to
> changes in the set of tracks of a MediaStream, and correspondingly
> update audio and video renderers.
> 
> BUG=720258
> 
> Review-Url: https://codereview.chromium.org/2969093002
> Cr-Commit-Position: refs/heads/master@{#490906}
> Committed:
https://chromium.googlesource.com/chromium/src/+/c9612ba8bf66e48a32301e35425d...

TBR=dalecurtis@chromium.org,emircan@chromium.org,foolip@chromium.org,mkwst@ch...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=720258
==========

to

==========
Revert of Make rendering of MediaStreams reflect changes to its set of tracks.
(patchset #6 id:120001 of https://codereview.chromium.org/2969093002/ )

Reason for revert:
Breaking build
https://uberchromegw.corp.google.com/i/chromium.linux/builders/Cast%20Audio%2...

Original issue's description:
> Make rendering of MediaStreams reflect changes to its set of tracks.
> 
> Before this CL, MediaStreams assigned to a media element required
> reassignment of the stream to the element in order to make changes
> to the set of tracks visible.
> 
> This CL fixes this problem by making WebMediaPlayerMS subscribe to
> changes in the set of tracks of a MediaStream, and correspondingly
> update audio and video renderers.
> 
> BUG=720258
> 
> Review-Url: https://codereview.chromium.org/2969093002
> Cr-Commit-Position: refs/heads/master@{#490906}
> Committed:
https://chromium.googlesource.com/chromium/src/+/c9612ba8bf66e48a32301e35425d...

TBR=dalecurtis@chromium.org,emircan@chromium.org,foolip@chromium.org,mkwst@ch...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=720258

Review-Url: https://codereview.chromium.org/2985393002
Cr-Commit-Position: refs/heads/master@{#490920}
Committed:
https://chromium.googlesource.com/chromium/src/+/b35b4c271b7819e3661942ab2c72...
==========

[commit-bot: I haz the power, 2017-08-01 08:55:29]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b35b4c271b7819e3661942ab2c72...

[Guido Urdaneta, 2017-08-02 09:52:28]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2994473002/ by guidou@chromium.org.

The reason for reverting is: BUILD files have been fixed in a separate CL, so
this is safe to reland..