Suppress redefinition warning.

core/msg.js

@@ -40,6 +40,7 @@ goog.getMsgOrig = goog.getMsg;
  * @param {string} str Translatable string, places holders in the form {$foo}.
  * @param {Object<string, string>=} opt_values Maps place holder name to value.
  * @return {string} message with placeholders filled.
+ * @suppress {duplicate}
  */
 goog.getMsg = function(str, opt_values) {
   var key = goog.getMsg.blocklyMsgMap[str];