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This "Turn off" button just resets the content setting to the default
setting, which is now BLOCK.

Bug: 965760
Change-Id: I32002bfdcad61ee36041d1ecb733b4cdc52981ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1629041
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663915}