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By implementing GetRestrictionSetForURL() we finally connect on screen content
restrictions to the policy rules engine (DlpRulesManager) and resolve the TODO.

Bug: 1109783
Change-Id: I29e62a2b33e7051cfc00b40179bfe5c8d48d0e72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421895Reviewed-by: Aya Elsayed <ayaelattar@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810505}