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If user blocks the usage of Bluetooth scanning API, all previously granted
permission should be revoked. This CL adds code to do that.

Bug: 969112
Change-Id: I4040673c8ddbc49e6de4657cf43ce7a148e03f39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636645
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667264}