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With this change, the code now only lives on the UI thread.

Bug: 825242, 777915
Change-Id: I3330347910559bb464a693a412182930415cb639
Reviewed-on: https://chromium-review.googlesource.com/998526
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549425}