Update Chromoting to use /third_party/closure_compiler.

remoting/webapp/crd/js/menu_button.js

Index: remoting/webapp/crd/js/menu_button.js
diff --git a/remoting/webapp/crd/js/menu_button.js b/remoting/webapp/crd/js/menu_button.js
index ce09776114a9cd11e58f11df70fba6c45529a78f..7d593bad46425ca905e337406c0f648d54828d13 100644
--- a/remoting/webapp/crd/js/menu_button.js
+++ b/remoting/webapp/crd/js/menu_button.js
@@ -106,9 +106,9 @@ remoting.MenuButton.prototype.menu = function() {
  */
 remoting.MenuButton.select = function(item, selected) {
   if (selected) {
-    /** @type {DOMTokenList} */(item.classList).add('selected');
+    item.classList.add('selected');
   } else {
-    /** @type {DOMTokenList} */(item.classList).remove('selected');
+    item.classList.remove('selected');
   }
 };