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This is part of efforts to replace base::ThreadTaskRunnerHandle::Get()
with other appropriate task runners in the renderer.

Bug: 786332
Change-Id: Ie55366522fb749fb895806b0ec423a22e9842330
Reviewed-on: https://chromium-review.googlesource.com/808093
Commit-Queue: Tommi <tommi@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522043}