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This is a reland of 4e31d46a

Original change's description:
> Immediately stop media streams if users revokes consent
>
> Since camera and microphone are particularly sensitive permissions we
> should be viligent and stop streams immediately when the user revokes
> the permission.
>
> This CL uses the permission controller subscription functionality to
> listen to permission changes on the relevant origins. Each DeviceRequest
> will have up to 2 permission subscriptions (1 audio, 1 video). When
> a permission is changed to non-Granted the specific DeviceRequest is
> canceled. Subscriptions are removed when the DeviceRequest is deleted.
>
> Because MediaStreamManager is an IO thread class but
> PermissionController is a UI thread class, this CL has to do a bit of
> thread hoping:
>
> FinalizeStream(IO) > SubscribeToPermissionControllerOnUIThread(UI) >
> SetPermissionSubscriptionIDs(IO) >(maybe)>
> UnsubscribeFromPermissionControllerOnUIThread(UI)
>
> DeleteRequest(IO) > UnsubscribeFromPermissionControllerOnUIThread(UI)
>
> Bug: 1116435
>
> Change-Id: I6649125e028d607eeb7ba5701b710a715addf6f2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352790
> Commit-Queue: Andy Paicu <andypaicu@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798564}

Bug: 1116435
Change-Id: Iede170df981bc69d025bcf66b029237977bc7a04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362288
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799549}