ash: Update launcher overflow chevron.

ash/launcher/launcher_view.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 ASH_LAUNCHER_LAUNCHER_VIEW_H_
 #define ASH_LAUNCHER_LAUNCHER_VIEW_H_
 
 #include <utility>
 #include <vector>
 
 #include "ash/launcher/launcher_button_host.h"
 #include "ash/launcher/launcher_model_observer.h"
 #include "ash/wm/shelf_types.h"
 #include "base/observer_list.h"
 #include "ui/views/animation/bounds_animator_observer.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/view.h"
 
 namespace views {
 class BoundsAnimator;
-class ImageButton;
 class MenuRunner;
 class ViewModel;
 }
 
 namespace ash {
 
 namespace test {
 class LauncherViewTestAPI;
 }
 
 class LauncherDelegate;
 struct LauncherItem;
 class LauncherIconObserver;
 class LauncherModel;
 
 namespace internal {
 
 class LauncherButton;
 class LauncherTooltipManager;
 class ShelfLayoutManager;
 class OverflowBubble;
+class OverflowButton;
 
 class ASH_EXPORT LauncherView : public views::View,
                                 public LauncherModelObserver,
                                 public views::ButtonListener,
                                 public LauncherButtonHost,
                                 public views::ContextMenuController,
                                 public views::FocusTraversable,
                                 public views::BoundsAnimatorObserver {
  public:
   LauncherView(LauncherModel* model,
@@ skipping 176 matching lines @@
   // LauncherView is hosted in an overflow bubble. In this mode, it does not
   // show browser, app list and overflow button.
   int first_visible_index_;
 
   // Last index of a launcher button that is visible
   // (does not go into overflow).
   int last_visible_index_;
 
   scoped_ptr<views::BoundsAnimator> bounds_animator_;
 
-  views::ImageButton* overflow_button_;
+  OverflowButton* overflow_button_;
 
   scoped_ptr<OverflowBubble> overflow_bubble_;
 
   scoped_ptr<LauncherTooltipManager> tooltip_;
 
   // Pointer device that initiated the current drag operation. If there is no
   // current dragging operation, this is NONE.
   Pointer drag_pointer_;
 
   // The view being dragged. This is set immediately when the mouse is pressed.
@@ skipping 23 matching lines @@
   // alignment).
   int leading_inset_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_VIEW_H_