ash: Rename LauncherButtonHost to ShelfButtonHost.

ash/shelf/app_list_button.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 ASH_SHELF_APP_LIST_BUTTON_H_
 #define ASH_SHELF_APP_LIST_BUTTON_H_
 
 #include "ui/views/controls/button/image_button.h"
 
 namespace ash {
 namespace internal {
 
-class LauncherButtonHost;
+class ShelfButtonHost;
 
-// Button used for the AppList icon on the launcher.
+// Button used for the AppList icon on the shelf.
 class AppListButton : public views::ImageButton {
  public:
-  AppListButton(views::ButtonListener* listener,
-                LauncherButtonHost* host);
+  AppListButton(views::ButtonListener* listener, ShelfButtonHost* host);
   virtual ~AppListButton();
 
   void StartLoadingAnimation();
   void StopLoadingAnimation();
 
  protected:
   // views::ImageButton:
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseMoved(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
  private:
-  LauncherButtonHost* host_;
+  ShelfButtonHost* host_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListButton);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SHELF_APP_LIST_BUTTON_H_