chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/toolbar/toolbar_view.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_VIEW_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 21 matching lines @@
 
 namespace autofill {
 class SaveCardBubbleController;
 class SaveCardBubbleView;
 }
 
 namespace bookmarks {
 class BookmarkBubbleObserver;
 }
 
-namespace extensions {
-class Command;
-class Extension;
-}
-
 // The Browser Window's toolbar.
 class ToolbarView : public views::AccessiblePaneView,
                     public views::MenuButtonListener,
                     public ui::AcceleratorProvider,
                     public LocationBarView::Delegate,
                     public content::NotificationObserver,
                     public CommandObserver,
                     public views::ButtonListener,
                     public AppMenuIconController::Delegate {
  public:
@@ skipping 164 matching lines @@
 
   // The display mode used when laying out the toolbar.
   const DisplayMode display_mode_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ToolbarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_VIEW_H_