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Fixes a bug where local audio unmutes briefly for a second when the
Mirroring Service switches between mirroring and remoting. This is
accomplished by holding a "Muter" sentinel throughout the whole session
to ensure no accidental audio leakage happens while loopback capture is
closed/re-started.

In my quest to fix the bug, it became clear that the
content::AudioLoopbackStreamCreator does not provide the
granularity-of-control needed for the muting bugfix. Thus, this change
has CastMirroringServiceHost invoke the Audio Service mojo APIs
directly.

Bug: 1111026
Change-Id: I9b3e60814306be2179d46a5daeb4c7e8ccee1bdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504636Reviewed-by: Jordan Bayles <jophba@chromium.org>
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824740}