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This CL adds a check in SoundContentSettingObserver to avoid unmuting a
tab if muted by the audio indicator.

Bug: 806482
Change-Id: I433c1fcb7a8e8034a9b100077e2f876e88a7d409
Reviewed-on: https://chromium-review.googlesource.com/891259Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532861}