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This reverts commit e60e1e6e.

Reason for revert: 
MediaNotificationBackgroundTest.BoundsSanityCheck
MediaNotificationViewTest.UpdateArtworkFromItem
failure on  Linux ChromiumOS MSan Tests bot:
https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/12036

Original change's description:
> [Media Notification] Derive background color from artwork
> 
> The media notification should derive its background
> color from prominent colors in the artwork. This
> uses as similar algorithm from Android.
> 
> Also breaks out some of the logic of CalculateProminentColors
> so we can use it without the reset of the function. This
> is because we want uninteresting colors and do not want
> the color profile matching.
> 
> BUG=944598
> 
> Change-Id: I60df7f600f6fc881dfb38d2057c903a5679845df
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534923
> Commit-Queue: Becca Hughes <beccahughes@chromium.org>
> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
> Reviewed-by: Evan Stade <estade@chromium.org>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#644985}

TBR=sadrul@chromium.org,estade@chromium.org,beccahughes@chromium.org,steimel@chromium.org

Change-Id: Ie18b564a68ffdf2560492eb1e7cf53c59447ea54
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 944598
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543464Reviewed-by: Ella Ge <eirage@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645338}