Wrap util.js in an IIFE to prevent deploy error

'use strict' can mess up execution of third-party scripts if
they are all concatenated to the same file. To prevent this, code
is wrapped in an immediately-invoked function expression (IIFE).
This ensures that the strict mode is only applied within the scope
of the function it’s wrapped in.

Change-Id: I59e433b419e2e7b85f87cc97d3add577e2c7590e

polygerrit-ui/app/scripts/util.js

@@ -11,10 +11,10 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-
+(function(window) {
   'use strict';
 
-var util = util || {};
+  var util = window.util || {};
 
   util.parseDate = function(dateStr) {
     // Timestamps are given in UTC and have the format
@@ -54,3 +54,6 @@ util.getCookie = function(name) {
     }
     return '';
   };
+
+  window.util = util;
+})(window);