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The signature on the user cloud policy blob is already verified by the session
manager on ChromeOS, but should also be verified by Chrome before storing new
policy, and after loading policy from the cache.

BUG=174015


Review URL: https://chromiumcodereview.appspot.com/12183017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182279 0039d316-1c4b-4281-b951-d872f2087c98