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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: Ic63ac5a7cef4546603ec211c81fa64c49595cee2
Reviewed-on: https://chromium-review.googlesource.com/805576Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521614}