Run clang-format on .js files in c/b/r/md_extensions

chrome/browser/resources/md_extensions/item_list.js

 // Copyright 2015 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('extensions', function() {
   var ItemList = Polymer({
     is: 'extensions-item-list',
 
-    behaviors: [
-      Polymer.NeonAnimatableBehavior,
-      Polymer.IronResizableBehavior
-    ],
+    behaviors: [Polymer.NeonAnimatableBehavior, Polymer.IronResizableBehavior],
 
     properties: {
       /** @type {Array<!chrome.developerPrivate.ExtensionInfo>} */
       items: Array,
 
       /** @type {extensions.ItemDelegate} */
       delegate: Object,
 
       inDevMode: {
         type: Boolean,
@@ skipping 52 matching lines @@
       return this.items.filter(function(item) {
         return item.name.toLowerCase().includes(this.filter.toLowerCase());
       }, this);
     },
   });
 
   return {
     ItemList: ItemList,
   };
 });