WebUI: Undo some usages of ES6 features that break uglify.

chrome/browser/resources/settings/search_settings.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.
 
 cr.define('settings', function() {
   /** @const {string} */
   var WRAPPER_CSS_CLASS = 'search-highlight-wrapper';
 
   /** @const {string} */
   var ORIGINAL_CONTENT_CSS_CLASS = 'search-highlight-original-content';
@@ skipping 39 matching lines @@
    * Finds all previous highlighted nodes under |node| (both within self and
    * children's Shadow DOM) and replaces the highlights (yellow rectangle and
    * search bubbles) with the original text node.
    * TODO(dpapad): Consider making this a private method of TopLevelSearchTask.
    * @param {!Node} node
    * @private
    */
   function findAndRemoveHighlights_(node) {
     var wrappers = node.querySelectorAll('* /deep/ .' + WRAPPER_CSS_CLASS);
 
-    for (var wrapper of wrappers) {
+    for (var i = 0; i < wrappers.length; i++ ) {
+      var wrapper = wrappers[i];
       var originalNode = wrapper.querySelector(
           '.' + ORIGINAL_CONTENT_CSS_CLASS);
       wrapper.parentElement.replaceChild(originalNode.firstChild, wrapper);
     }
 
     var searchBubbles = node.querySelectorAll(
         '* /deep/ .' + SEARCH_BUBBLE_CSS_CLASS);
-    for (var searchBubble of searchBubbles)
-      searchBubble.remove();
+    for (var j = 0; j < searchBubbles.length; j++)
+      searchBubbles[j].remove();
   }
 
   /**
    * Applies the highlight UI (yellow rectangle) around all matches in |node|.
    * @param {!Node} node The text node to be highlighted. |node| ends up
    *     being removed from the DOM tree.
    * @param {!Array<string>} tokens The string tokens after splitting on the
    *     relevant regExp. Even indices hold text that doesn't need highlighting,
    *     odd indices hold the text to be highlighted. For example:
    *     var r = new RegExp('(foo)', 'i');
@@ skipping 526 matching lines @@
   function setSearchManagerForTesting(searchManager) {
     SearchManagerImpl.instance_ = searchManager;
   }
 
   return {
     getSearchManager: getSearchManager,
     setSearchManagerForTesting: setSearchManagerForTesting,
     SearchRequest: SearchRequest,
   };
 });