Move HoverButton and HoverImageButton from chrome/browser/ui/cocoa/ to ui/base/cocoa.

chrome/browser/ui/cocoa/location_bar/action_box_menu_bubble_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_LOCATION_BAR_ACTION_BOX_MENU_BUBBLE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_ACTION_BOX_MENU_BUBBLE_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 #import "ui/base/cocoa/tracking_area.h"
 
 class ActionBoxMenuModel;
-@class HoverImageButton;
 class ExtensionIconLoaderBridge;
 class Profile;
 
 // This window controller manages the action box popup menu.
 @interface ActionBoxMenuBubbleController : BaseBubbleController {
  @private
   Profile* profile_;
 
   // The model that contains the data from the backend.
   scoped_ptr<ActionBoxMenuModel> model_;
@@ skipping 72 matching lines @@
 
   // Used to highlight the background on hover.
   ui::ScopedCrTrackingArea trackingArea_;
 }
 
 @property(assign, nonatomic) ActionBoxMenuItemController* viewController;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_ACTION_BOX_MENU_BUBBLE_CONTROLLER_H_