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This fixes the behavior of the web notification tray with launcher auto-hide.
It also fixes visibility of the web notification tray in the lock screen.

BUG=142506

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=151752

Review URL: https://chromiumcodereview.appspot.com/10834338

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151775 0039d316-1c4b-4281-b951-d872f2087c98