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This fixes the failing policy_prefs_ui tests testTogglePolicyTogglesBanner and testPoliciesShowBanner and re-enables these tests.

BUG=102546
TEST=policy_prefs_ui

Review URL: http://codereview.chromium.org/8423031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108230 0039d316-1c4b-4281-b951-d872f2087c98