Fix unhandled SecurityException in iOS password_controller

ios/chrome/browser/passwords/resources/password_controller.js

 // Copyright 2012 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.
 
 // This file adheres to closure-compiler conventions in order to enable
 // compilation with ADVANCED_OPTIMIZATIONS. See http://goo.gl/FwOgy
 //
 // Installs password management functions on the |__gCrWeb| object.
 //
 // Finds all password forms in the current document and extracts
@@ skipping 196 matching lines @@
    *
    * @param {Object} formData Form data.
    * @param {string} username The username to fill.
    * @param {string} password The password to fill.
    * @param {Object} win A window or a frame containing formData.
    * @param {string=} opt_normalizedOrigin The origin URL to compare to.
    * @return {boolean} Whether a form field has been filled.
    */
   __gCrWeb.fillPasswordFormWithData =
       function(formData, username, password, win, opt_normalizedOrigin) {
-    var doc = win.document;
+    var doc = null;
+
+    try {
+      doc = win.document;
+    } catch(e) {
+    }
 
     // If unable to read the 'document' property from a frame in a different
     // origin, do nothing.
     if (!doc) {
       return false;
     }
 
     var origin = formData['origin'];
     var normalizedOrigin = opt_normalizedOrigin ||
         __gCrWeb.common.removeQueryAndReferenceFromURL(win.location.href);
@@ skipping 189 matching lines @@
       'method': formElement.getAttribute('method'),
       'name': __gCrWeb.common.getFormIdentifier(formElement),
       'origin': origin,
       'fields': fields,
       'usernameElement': usernameElement,
       'usernameValue': usernameValue,
       'passwords': passwords
     };
   };
 }