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Reland of Make rendering of MediaStreams reflect changes to its set of tracks. (patchset #1 id:1 of https://codereview.chromium.org/2985393002/ )

Reason for revert:
BUILD files have been fixed in a separate CL, so this is safe to reland.

Original issue's description:
> 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

TBR=dalecurtis@chromium.org,emircan@chromium.org,foolip@chromium.org,mkwst@chromium.org,jkrcal@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=720258

Review-Url: https://codereview.chromium.org/2994473002
Cr-Commit-Position: refs/heads/master@{#491341}