Add ability to mute chrome:// pages

Bug: 787743, 785711, 782134
Change-Id: I77fe9a7192697ebe82734231ae709c2094b57b62
Reviewed-on: https://chromium-review.googlesource.com/791813
Commit-Queue: Tommy Steimel <[email protected]>
Reviewed-by: Mounir Lamouri <[email protected]>
Reviewed-by: Scott Violet <[email protected]>
Cr-Commit-Position: refs/heads/master@{#520203}
5 files changed