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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: 780785, 786332
Change-Id: Ic9801a4896dd4d9a70f9b9fa4f5b26dc474db224
Reviewed-on: https://chromium-review.googlesource.com/930524Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539071}