Cleanup forward declared classes that are not needed.

chrome/views/button_dropdown.h

 // Copyright (c) 2006-2008 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_VIEWS_BUTTON_DROPDOWN_H__
 #define CHROME_VIEWS_BUTTON_DROPDOWN_H__
 
 #include "base/task.h"
 #include "chrome/views/button.h"
 #include "chrome/views/menu.h"
 
-class Timer;
-
 namespace views {
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // ButtonDropDown
 //
 // A button class that when pressed (and held) or pressed (and drag down) will
 // display a menu
 //
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 35 matching lines @@
 
   // Specifies who to delegate populating the menu
   Menu::Delegate* menu_delegate_;
 
   // Y position of mouse when left mouse button is pressed
   int y_position_on_lbuttondown_;
 
   // A factory for tasks that show the dropdown context menu for the button.
   ScopedRunnableMethodFactory<ButtonDropDown> show_menu_factory_;
 
-  DISALLOW_EVIL_CONSTRUCTORS(ButtonDropDown);
+  DISALLOW_COPY_AND_ASSIGN(ButtonDropDown);
 };
 
 }  // namespace views
 
 #endif  // CHROME_VIEWS_BUTTON_DROPDOWN_H__
-