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This reverts commit b7d9656d.

Reason for revert: Tests are flaky on several builders, see https://crbug.com/1086794

Original change's description:
> [Media History] Do not record background or muted watchtime
> 
> Adds a fix so that Media History does not record
> background or muted watchtime since they are not
> useful to us (we only want foreground unmuted).
> 
> BUG=1086511
> 
> Change-Id: I175c20ad88c136f291b72ae021b3cc22729bc5f6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216375
> Commit-Queue: Becca Hughes <beccahughes@chromium.org>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#771995}

TBR=dalecurtis@chromium.org,beccahughes@chromium.org,steimel@chromium.org

Change-Id: Ie59c985576436a2443448b4141cc51fd09f75176
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1086511, 1086794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215828Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772156}