MD Settings: Remove some ES6 leftovers from CrOS code that break uglify.

chrome/browser/resources/settings/languages_page/manage_input_methods_page.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview 'settings-manage-input-methods-page' is a sub-page for enabling
  * and disabling input methods. Input methods are grouped by base languages to
  * avoid showing duplicate or ambiguous input methods.
  *
  * @group Chrome Settings Elements
@@ skipping 126 matching lines @@
       var displayLanguage = languageState.language;
       if (languageFamilyCodes.length > 1) {
         var baseLanguage = this.languageHelper.getLanguage(baseLanguageCode);
         if (baseLanguage)
           displayLanguage = baseLanguage;
       }
       languageList.push({
         language: displayLanguage,
         inputMethods: combinedInputMethods,
       });
-      for (var languageCode of languageFamilyCodes)
-        usedLanguages.add(languageCode);
+      for (var k = 0; k < languageFamilyCodes.length; k++)
+        usedLanguages.add(languageFamilyCodes[k]);
     }
 
     this.languageList_ = languageList;
     this.notifyInputMethodsChanged_();
   },
 
   /**
    * Returns the input methods that support any of the given languages.
    * @param {!Array<string>} languageCodes
    * @return {!Array<!chrome.languageSettingsPrivate.InputMethod>}
    * @private
    */
   getInputMethodsForLanguages: function(languageCodes) {
     // Input methods that have already been listed for this language.
     var /** !Set<string> */ usedInputMethods = new Set();
     /** @type {!Array<chrome.languageSettingsPrivate.InputMethod>} */
     var combinedInputMethods = [];
-    for (var languageCode of languageCodes) {
+    for (var i = 0; i < languageCodes.length; i++) {
       var inputMethods = this.languageHelper.getInputMethodsForLanguage(
-          languageCode);
+          languageCodes[i]);
       // Get the language's unused input methods and mark them as used.
       var newInputMethods = inputMethods.filter(function(inputMethod) {
         if (usedInputMethods.has(inputMethod.id))
           return false;
         usedInputMethods.add(inputMethod.id);
         return true;
       });
       [].push.apply(combinedInputMethods, newInputMethods);
     }
     return combinedInputMethods;
   },
 
   // TODO(Polymer/polymer#3603): We have to notify Polymer of properties that
   // may have changed on nested objects, even when the outer property itself
   // is set to a new array.
   // TODO(michaelpg): Test this behavior.
   /** @private */
   notifyInputMethodsChanged_: function() {
     for (var i = 0; i < this.languageList_.length; i++) {
       for (var j = 0; j < this.languageList_[i].inputMethods.length; j++) {
         this.notifyPath(
             'languageList_.' + i + '.inputMethods.' + j + '.enabled',
             this.languageList_[i].inputMethods[j].enabled);
       }
     }
   },
 });