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 MPX itself doesn't know how to handle events and we've been converting MessageLoop::Run() -> Desktop::Run() or RunAllPending to use ui_test_utils::RunAllPendingInMessageLoop(). It's no longer necessary with this CL.

Windows's message pump can dispatch events without dispatcher.

BUG=none
TEST=none, but I believe some of browser_tests on aura is flaky because of this, and this CL should make them less/non flaky.


Review URL: http://codereview.chromium.org/8635014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111324 0039d316-1c4b-4281-b951-d872f2087c98