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This reverts commit 45a0df8f.

Reason for revert: Mac tests flaky, due to filesystem storing time in second increments only.

Original change's description:
> Reland "Update BrowsingDataRemoverBrowserTest to include MediaLicenses"
> 
> Original change's description:
> > MediaLicenses can be cleared from the ClearBrowsingData dialog, so update the
> > BrowsingDataRemoverBrowserTest to check them as well. This uses the test-only
> > External Clear Key CDM to store the license in the file system, if it is
> > available.
> >
> 
> This reverts commit 72f2d4cd.
> 
> BUG=808690,879812
> TEST=new browser_tests pass
> 
> Change-Id: Ie9e9229fc85244eed922d93dce82cb3fa09bbe5c
> Reviewed-on: https://chromium-review.googlesource.com/c/1342779
> Reviewed-by: Christian Dullweber <dullweber@chromium.org>
> Commit-Queue: John Rummell <jrummell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#609752}

TBR=jrummell@chromium.org,dullweber@chromium.org

Change-Id: I1c49014959d10fb9eb2306af0f71cb724ef40070
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 808690, 879812
Reviewed-on: https://chromium-review.googlesource.com/c/1344884Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609790}