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This reverts commit 7d2d8cc1.

Reason for revert: This is likely the cause of build breakage for
Linux ChromiumOS MSan Tests since https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/20301
The failed test is MediaNotificationViewImplTest.UnfreezingWaitsForArtwork_Timeout

Original change's description:
> GMC: Redesign audio picker UI
> 
> Implement the new UI for the audio device picker in global media
> controls. As part of this change, the MediaNotificationBackground will
> draw a gradient between the device picker and notification artwork if
> the picker is availabile.
> 
> Screenshots of this updated UI will be posted on the crbug.
> 
> Change-Id: Ic7186c770102663b08e85b56eeddfbfa13833c3c
> Bug: 1117160
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358512
> Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800243}

TBR=steimel@chromium.org,noahrose@google.com

Change-Id: I2b9d9d6df1afc9ca8fdb967fad0a35c3273db879
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1117160
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367427Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800496}