[ios] Put autofill scripts into anonymous function.

components/autofill/ios/browser/resources/autofill_controller.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Installs Autofill management functions on the |__gCrWeb| object.
 //
 // It scans the DOM, extracting and storing forms and returns a JSON string
 // representing an array of objects, each of which represents an Autofill form
 // with information about a form to be filled and/or submitted and it can be
 // translated to struct FormData
 // (chromium/src/components/autofill/core/common/form_data.h) for further
 // processing.
 
+/* Beginning of anonymous object. */
+(function() {
+
 /** @typedef {HTMLInputElement|HTMLTextAreaElement|HTMLSelectElement} */
 var FormControlElement;
 
 /**
   * @typedef {{
   *   name: string,
   *   value: string,
   *   form_control_type: string,
   *   autocomplete_attributes: string,
   *   max_length: number,
@@ skipping 2031 matching lines @@
         continue;
       }
       var elementName = __gCrWeb['common'].nameForAutofill(element);
       var value = formData[elementName];
       if (value) {
         element.placeholder = value;
       }
     }
   }
 };
+
+}());  // End of anonymous object