Made the visibility of Buttom bar updated at the end of drag selection.

chrome/browser/resources/file_manager/js/file_manager.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /**
  * This variable is checked in SelectFileDialogExtensionBrowserTest.
  * @type {number}
  */
@@ skipping 1145 matching lines @@
     this.table_.list.addEventListener('blur', fileListBlurBound);
     this.grid_.addEventListener('blur', fileListBlurBound);
 
     var dragStartBound = this.onDragStart_.bind(this);
     this.table_.list.addEventListener('dragstart', dragStartBound);
     this.grid_.addEventListener('dragstart', dragStartBound);
 
     var dragEndBound = this.onDragEnd_.bind(this);
     this.table_.list.addEventListener('dragend', dragEndBound);
     this.grid_.addEventListener('dragend', dragEndBound);
+    // This event is published by DragSelector because drag end event is not
+    // published at the end of drag selection.
+    this.table_.list.addEventListener('dragselectionend', dragEndBound);
 
     // TODO(mtomasz, yoshiki): Create sidebar earlier, and here just attach
     // the directory model.
     this.initSidebar_();
 
     this.table_.addEventListener('column-resize-end',
                                  this.updateStartupPrefs_.bind(this));
 
     // Restore preferences.
     this.directoryModel_.sortFileList(
@@ skipping 2631 matching lines @@
    * Set the flag to hide the selecting checkboxes.
    * This is the alternative for about:flags and to be removed.
    * TODO(hirono): Remove this function after the user test.
    * @param {boolean} flag If it's true, the selecting checkboxes are hidden.
    */
   window.setNoCheckboxesFlag = function(flag) {
     fileManager.noCheckboxes_ = flag;
     fileManager.updateStartupPrefs_();
   };
 })();