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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: 827065
Change-Id: I6b4d582ba9e1d53dfddebacc8baec199eb311271
Reviewed-on: https://chromium-review.googlesource.com/985995
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548683}