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MessageLoop is no longer a friend of RunLoop :)!

The only minor dependency remaining shows up in tests as allowing
nestable tasks in a scope (different from allowing nested loops on a
thread in general) is still a MessageLoop concept. I plan to move that
to RunLoop as well in a follow-up.

R=danakj@chromium.org

Bug: 703346
Change-Id: I0a6269c94de179d97c14855499edd70be9e1d1af
Reviewed-on: https://chromium-review.googlesource.com/594352Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491258}