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This reverts commit 9d157bc0.

Reason for revert: New behavior is not good, see bug/thread.

Original change's description:
> Update VolumeController behavior for hardware keys
> 
> Changing behavior as requested, and updating tests:
> 1) The mute button should toggle mute (rename mojo function).
> 2) Volume up/down buttons should adjust up/down normally when muted.
> 3) Volume up/down buttons should also un-mute (if above default mute level).
> 4) Volume down will still mute if the level is below the default mute level.
> 
> Bug: 895550, 895552
> Change-Id: I353ab3124bb0375f109b96841cce6df3c9839388
> Reviewed-on: https://chromium-review.googlesource.com/c/1289990
> Commit-Queue: Michael Wasserman <msw@chromium.org>
> Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#601191}

TBR=msw@chromium.org,tsepez@chromium.org,afakhry@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 895550, 895552
Change-Id: I6f4000a832bd0230f4da6a21e40b17b13b3823d2
Reviewed-on: https://chromium-review.googlesource.com/c/1306407Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603691}