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This reverts commit 3946a6ad.

Reason for revert: This is breaking the Windows build.

https://chromium-review.googlesource.com/c/chromium/src/+/803994 broke the Windows build and needs to be reverted, and as this CL is depending on it it need to be reverted too.

Original change's description:
> Media Engagement: Histograms for preloaded list.
> 
> This adds two histograms to MediaEngagementPreloadedList. The first is
> used when the list is loaded and will allow us to see if the loads are
> failing and why. The second is used when the list is checked and will
> allow us to see if the list has not been loaded or is empty, as well
> as how often the list is matching.
> 
> BUG=787464
> 
> Change-Id: I935405ef56aa197a2f32fbd85df7c9ae4851b12a
> Reviewed-on: https://chromium-review.googlesource.com/808305
> Commit-Queue: Becca Hughes <beccahughes@chromium.org>
> Reviewed-by: Jesse Doherty <jwd@chromium.org>
> Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#522085}

TBR=jwd@chromium.org,mlamouri@chromium.org,beccahughes@chromium.org

Change-Id: Id6f811e28c70063467a0ce1e97da59a2dc0e6c14
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 787464
Reviewed-on: https://chromium-review.googlesource.com/812044Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522183}