[Refactor] Move code for painting the window header for browser windows out of ash

ash/wm/custom_frame_view_ash.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_WM_CUSTOM_FRAME_VIEW_ASH_H_
 #define ASH_WM_CUSTOM_FRAME_VIEW_ASH_H_
 
 #include "ash/ash_export.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/window/non_client_view.h"
 
 namespace ash {
 class FrameBorderHitTestController;
-class HeaderPainter;
 class ImmersiveFullscreenController;
 }
 namespace views {
 class Widget;
 }
 
 namespace ash {
 
 // A NonClientFrameView used for packaged apps, dialogs and other non-browser
 // windows. It supports immersive fullscreen. When in immersive fullscreen, the
@@ skipping 53 matching lines @@
 
   // Updates the hittest bounds overrides based on the window state type.
   scoped_ptr<FrameBorderHitTestController> frame_border_hit_test_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomFrameViewAsh);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_CUSTOM_FRAME_VIEW_ASH_H_