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CookieMonster tests post a
base::MessageLoop::QuitWhenIdleClosure task which
could be run at the start of some other test, since
the unit tests are invoked in the same fixture on
Android. This CL converts these CookieMonster tests
to use base::RunLoop so they don't influence other
tests.

BUG=568282

Review URL: https://codereview.chromium.org/1634803004

Cr-Commit-Position: refs/heads/master@{#371908}