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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.
>
> The original CL was flaky due to Mac's only saving file timestamps to
> second granularity. As a result it was possible for the newly created license
> to be saved with a timestamp prior to the current actual time, and deleting
> "old" licenses would include it in the deletion. Change is to wait for some
> time on Macs only to ensure that the "new" license has a later timestamp.

This reverts commit b6bfa2b7.

BUG=808690
TEST=new browser_tests pass

Change-Id: Iad919ec23bf157a9bc4af3e6d54af2b28fdc217e
Reviewed-on: https://chromium-review.googlesource.com/c/1354498Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612301}