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I left the unittest in ash still for the time being as it requires a bunch of stuff from ash too (mostly the activation logic which is still in progress for Corewm).

http://crbug.com/162100
R=rouslan@chromium.org
Review URL: https://codereview.chromium.org/11316287

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170679 0039d316-1c4b-4281-b951-d872f2087c98