[MD Bookmarks] Fix Drag and drop timer.

chrome/browser/resources/md_bookmarks/dnd_manager.js

 // Copyright 2017 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('bookmarks', function() {
   /**
    * @param {BookmarkElement} element
    * @return {boolean}
    */
   function isBookmarkItem(element) {
@@ skipping 269 matching lines @@
     /** @private {bookmarks.DropIndicator} */
     this.dropIndicator_ = null;
 
     /** @private {Object<string, function(!Event)>} */
     this.documentListeners_ = null;
 
     /**
      * Used to instantly clearDragData in tests.
      * @private {function((Function|null|string), number)}
      */
-    this.setTimeout = window.setTimeout.bind(window);
+    this.setTimeout_ = window.setTimeout.bind(window);
   }
 
   DNDManager.prototype = {
     init: function() {
       this.dragInfo_ = new DragInfo();
       this.dropIndicator_ = new DropIndicator();
       this.autoExpander_ = new AutoExpander();
 
       this.documentListeners_ = {
         'dragstart': this.onDragStart_.bind(this),
@@ skipping 326 matching lines @@
       this.dropIndicator_.setTimeout = this.setTimeout_;
     }
   };
 
   return {
     DNDManager: DNDManager,
     DragInfo: DragInfo,
     DropIndicator: DropIndicator,
   };
 });