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MessageLoop will go away, eventually.

BUG=891670

Change-Id: I862c7162f8ce785e3533bb5869050b9047ffd317
Reviewed-on: https://chromium-review.googlesource.com/c/1352753
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611880}