Catches and ignores errors when accessing win.document in Password Autofill JS

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

Index: ios/chrome/browser/passwords/resources/password_controller.js
diff --git a/ios/chrome/browser/passwords/resources/password_controller.js b/ios/chrome/browser/passwords/resources/password_controller.js
index 7c4b8b9c65b8ce48f47c57169444776e78348760..f3bb4213d9097e437d8dd52d3c0753e3b917288e 100644
--- a/ios/chrome/browser/passwords/resources/password_controller.js
+++ b/ios/chrome/browser/passwords/resources/password_controller.js
@@ -343,10 +343,14 @@ if (__gCrWeb && !__gCrWeb['fillPasswordForm']) {
    *    look for password forms.
    */
   __gCrWeb.getPasswordFormDataList = function(formDataList, win) {
-    var doc = win.document;
+    var doc = null;
+
+    try {
+      // Security violations may generate an exception or null to be returned.
+      doc = win.document;
+    } catch(e) {
+    }
 
-    // We may not be allowed to read the 'document' property from a frame
-    // that is in a different domain.
     if (!doc) {
       return;
     }