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MediaLicense deletion was added in crrev.com/c/1213242 but due to a
confusion about the purpose of SiteDataDeleteHelper, it didn't work
correctly. This CL correctly implements MediaLicense deletion when
a site is reset from Settings > SiteSettings > AllSites > [Site].

Tested manually by adding a LOG statement to OriginMatcher in
website_preference_bridge.cc and testing that offline content stored
from https://shaka-player-demo.appspot.com/demo/ triggers the LOG
statement when resetting a site.

Bug: 883701
Change-Id: I28b93c44daea757084dc5b6e667a2d36bc00b70f
Reviewed-on: https://chromium-review.googlesource.com/c/1337623Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609985}