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There is no need to use SingleThreadTaskRunnerForTesting here.

Bug: 870606
Change-Id: I2219ece19db82e1636f2cb83eb4570dd1d09b08f
Reviewed-on: https://chromium-review.googlesource.com/1253524Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595724}