Make win_aura work without ash.

ui/aura/root_window_host_win.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 UI_AURA_ROOT_WINDOW_HOST_WIN_H_
 #define UI_AURA_ROOT_WINDOW_HOST_WIN_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/base/win/window_impl.h"
 
+namespace ui {
+class ViewProp;
+}
+
 namespace aura {
 
 class RootWindowHostWin : public RootWindowHost, public ui::WindowImpl {
  public:
   explicit RootWindowHostWin(const gfx::Rect& bounds);
   virtual ~RootWindowHostWin();
 
   // RootWindowHost:
   virtual void SetRootWindow(RootWindow* root_window) OVERRIDE;
+  virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void ToggleFullScreen() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual void SetCursor(gfx::NativeCursor cursor) OVERRIDE;
   virtual void ShowCursor(bool show) OVERRIDE;
@@ skipping 35 matching lines @@
   void OnSize(UINT param, const CSize& size);
 
   RootWindow* root_window_;
 
   bool fullscreen_;
   bool has_capture_;
   RECT saved_window_rect_;
   DWORD saved_window_style_;
   DWORD saved_window_ex_style_;
 
+  scoped_ptr<ui::ViewProp> prop_;
+
   DISALLOW_COPY_AND_ASSIGN(RootWindowHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_WIN_H_