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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: I71f58741822d6515d72210b93edba326c84f89b9
Reviewed-on: https://chromium-review.googlesource.com/807867Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522382}