Cleanup forward declared classes that are not needed.

chrome/views/base_button.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_BASE_BUTTON_H__
 #define CHROME_VIEWS_BASE_BUTTON_H__
 
 #include "chrome/common/animation.h"
 #include "chrome/views/event.h"
 #include "chrome/views/view.h"
 
-class OSExchangeData;
 class ThrobAnimation;
 
 namespace views {
 
 class MouseEvent;
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // BaseButton
 //
@@ skipping 135 matching lines @@
   std::wstring accessible_shortcut_;
   std::wstring accessible_name_;
 
   // The button state (defined in implementation)
   int state_;
 
   // Hover animation.
   scoped_ptr<ThrobAnimation> hover_animation_;
 
  private:
-  DISALLOW_EVIL_CONSTRUCTORS(BaseButton);
-
   // The current listener
   ButtonListener* listener_;
 
   // tag storage
   int tag_;
 
   // See description in mouse_event_flags().
   int mouse_event_flags_;
 
   // Should we animate when the state changes? Defaults to true, but false while
   // throbbing.
   bool animate_on_state_change_;
+
+  DISALLOW_COPY_AND_ASSIGN(BaseButton);
 };
 
 }  // namespace views
 
 #endif  // CHROME_VIEWS_BASE_BUTTON_H__