Revert of Allow muting/unmuting audio through media track API (patchset #37 id:710001 of https://codereview.chromium.org/1812543003/ )

Reason for revert:
Tentative revert since it looks like it cause flake on

http/tests/media/media-source/mediasource-config-change-webm-av-audio-bitrate.html

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11/builds/2433

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win10?numbuilds=200

Original issue's description:
> Allow muting/unmuting audio through media track API
>
> This CL implements muting/unmuting audio via HTML5 media track APIs.
> More specifically it adds basic plumbing to deliver media track state
> changes from blink level to media::Renderer, by translating blink track
> ids into DemuxerStream pointers in demuxer and then delivering
> DemuxerStream state information to media renderers.  For now audio
> stream is disabled by setting volume to 0, but this can be done more
> efficiently in the future.
>
> BUG=249427
>
> Committed: https://crrev.com/06e3a9ffca065ed73c1cd9e5d72f7ca2ee44f488
> Cr-Commit-Position: refs/heads/master@{#387789}

TBR=wolenetz@chromium.org,servolk@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=249427

Review URL: https://codereview.chromium.org/1894073002 .

Cr-Commit-Position: refs/heads/master@{#387883}
22 files changed