Files.app: Remove the ButterBar class.

chrome/browser/resources/file_manager/foreground/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';
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
@@ skipping 366 matching lines @@
     this.table_.setDateTimeFormat(use12hourClock);
   };
 
   /**
    * @private
    */
   FileManager.prototype.initDataTransferOperations_ = function() {
     this.fileOperationManager_ = FileOperationManagerWrapper.getInstance(
         this.backgroundPage_);
 
-    this.butterBar_ = new ButterBar(
-        this.dialogDom_, this.fileOperationManager_);
-
-    // CopyManager and ButterBar are required for 'Delete' operation in
+    // CopyManager are required for 'Delete' operation in
     // Open and Save dialogs. But drag-n-drop and copy-paste are not needed.
     if (this.dialogType != DialogType.FULL_PAGE) return;
 
     // TODO(hidehiko): Extract FileOperationManager related code from
     // FileManager to simplify it.
     this.onCopyProgressBound_ = this.onCopyProgress_.bind(this);
     this.fileOperationManager_.addEventListener(
         'copy-progress', this.onCopyProgressBound_);
 
     this.onEntryChangedBound_ = this.onEntryChanged_.bind(this);
@@ skipping 1871 matching lines @@
    */
   FileManager.prototype.onUnload_ = function() {
     if (this.directoryModel_)
       this.directoryModel_.dispose();
     if (this.volumeManager_)
       this.volumeManager_.dispose();
     if (this.filePopup_ &&
         this.filePopup_.contentWindow &&
         this.filePopup_.contentWindow.unload)
       this.filePopup_.contentWindow.unload(true /* exiting */);
-    if (this.butterBar_)
-      this.butterBar_.dispose();
     if (this.progressCenterPanel_)
       this.backgroundPage_.background.progressCenter.removePanel(
           this.progressCenterPanel_);
     if (this.fileOperationManager_) {
       if (this.onCopyProgressBound_) {
         this.fileOperationManager_.removeEventListener(
             'copy-progress', this.onCopyProgressBound_);
       }
       if (this.onEntryChangedBound_) {
         this.fileOperationManager_.removeEventListener(
@@ skipping 1272 matching lines @@
       callback(this.preferences_);
       return;
     }
 
     chrome.fileBrowserPrivate.getPreferences(function(prefs) {
       this.preferences_ = prefs;
       callback(prefs);
     }.bind(this));
   };
 })();