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This CL trims down the UserManager interfaces by moving the *UserLogged
methods that are really just implementation details to UserManagerImpl.

BUG=None
TEST=Manual and browser/unit tests

Review URL: https://chromiumcodereview.appspot.com/14069017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194938 0039d316-1c4b-4281-b951-d872f2087c98