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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: Id3a68d0efd803d9ab3c1670bfa641ca9641c3af9
Reviewed-on: https://chromium-review.googlesource.com/776641Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519596}