Revert of [ios] Pass more --jscomp_error switches to the closure Compiler.

ios/web/web_state/js/resources/message.js

Index: ios/web/web_state/js/resources/message.js
diff --git a/ios/web/web_state/js/resources/message.js b/ios/web/web_state/js/resources/message.js
index 47d32a78c24a6fb9bca96fc1a6531bf39584cc79..1649a64e98de39008a18df015a63653fffcf2b3e 100644
--- a/ios/web/web_state/js/resources/message.js
+++ b/ios/web/web_state/js/resources/message.js
@@ -12,11 +12,6 @@
  * Namespace for this module.
  */
 __gCrWeb.message = {};
-
-// Store message namespace object in a global __gCrWeb object referenced by a
-// string, so it does not get renamed by closure compiler during the
-// minification.
-__gCrWeb['message'] = __gCrWeb.message;
 
 /* Beginning of anonymous object. */
 (function() {
@@ -40,7 +35,7 @@
   /**
    * Invokes a command on the Objective-C side.
    * @param {Object} command The command in a JavaScript object.
-   * @public
+   * @private
    */
   __gCrWeb.message.invokeOnHost = function(command) {
     messageQueue_.queue.push(command);
@@ -79,7 +74,7 @@
     queueObject.queue.forEach(function(command) {
         var stringifiedMessage = __gCrWeb.common.JSONStringify({
             "crwCommand": command,
-            "crwWindowId": __gCrWeb['windowId']
+            "crwWindowId": __gCrWeb.windowId
         });
         // A web page can override |window.webkit| with any value. Deleting the
         // object ensures that original and working implementation of