[ios] Put autofill scripts into anonymous function.

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

Index: components/autofill/ios/browser/resources/autofill_controller.js
diff --git a/components/autofill/ios/browser/resources/autofill_controller.js b/components/autofill/ios/browser/resources/autofill_controller.js
index 50ec7364308aab36833cf0837bca65b00033b450..2ca8c41bd592500106bb26f741d279811a7e3ac0 100644
--- a/components/autofill/ios/browser/resources/autofill_controller.js
+++ b/components/autofill/ios/browser/resources/autofill_controller.js
@@ -11,6 +11,9 @@
 // (chromium/src/components/autofill/core/common/form_data.h) for further
 // processing.
 
+/* Beginning of anonymous object. */
+(function() {
+
 /** @typedef {HTMLInputElement|HTMLTextAreaElement|HTMLSelectElement} */
 var FormControlElement;
 
@@ -2062,3 +2065,5 @@ __gCrWeb.autofill['fillPredictionData'] = function(data) {
     }
   }
 };
+
+}());  // End of anonymous object