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Causes views_unittests EventMonitorTest.ShouldNotReceiveEventsFromOtherWindow to fail, see
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/35121/steps/views_unittests/logs/stdio

This reverts commit e393fdb1.

Cr-Commit-Position: refs/heads/master@{#307985}