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A small step towards deleting MessageLoop.

TBR=fdoray@chromium.org

Bug: 891670
Change-Id: I6ca110d71acc5c6385e62f12885c799cf5f01f40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635253Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664311}