GitLab

This CL implements revoking previously granted permission for Bluetooth Scanning API
when a tab is switched to background.

Design doc:
https://docs.google.com/document/d/1k4WM56Dx7sCu2k2MjvOdXArNz2Dy8BA1vt2VYHA6v7A/edit

Bug: 953075
Change-Id: I6690dcab7bfe8b41162cb3d1c98f8c18863955ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614423
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666157}