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

Bug: 786332
Change-Id: Id56592620375d8a62825511a93a825e135c28f60
Reviewed-on: https://chromium-review.googlesource.com/980015
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546778}