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

components/translate/ios/browser/resources/translate_ios.js

Index: components/translate/ios/browser/resources/translate_ios.js
diff --git a/components/translate/ios/browser/resources/translate_ios.js b/components/translate/ios/browser/resources/translate_ios.js
index 9dfda6a4cad253762a8704fedee98a436cc62f83..af823474c1c6d7e602d199b884b9a6d32fbfbe02 100644
--- a/components/translate/ios/browser/resources/translate_ios.js
+++ b/components/translate/ios/browser/resources/translate_ios.js
@@ -2,7 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-__gCrWeb['translate'] = {};
+/**
+ * @fileoverview Installs Translate management functions on the __gCrWeb object.
+ *
+ * TODO(crbug.com/659442): Enable checkTypes, checkVars errors for this file.
+ * @suppress {checkTypes, checkVars}
+ */
+
+__gCrWeb.translate = {};
+__gCrWeb['translate'] = __gCrWeb.translate;
 
 (function() {
 /**