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Clearing browser data can be done with filters that specify origin
white lists or black lists, so update the code that clears media licenses
to handle a filter if one provided.

BUG=901993
TEST=new browser_test passes

Change-Id: I413703b456479fc8b85916c96eda6df7cbea2550
Reviewed-on: https://chromium-review.googlesource.com/c/1383308Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620007}