Make aura::clients take Window instead of RootWindow

ui/views/widget/desktop_aura/desktop_drop_target_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_VIEWS_WIDGET_DESKTOP_AURA_DESKTIOP_DROP_TARGET_WIN_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTIOP_DROP_TARGET_WIN_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/dragdrop/drop_target_win.h"
 
 namespace aura {
-class RootWindow;
 namespace client {
 class DragDropDelegate;
 }
 }
 
 namespace ui {
 class DropTargetEvent;
 class OSExchangeData;
 }
 
 namespace views {
 
 // DesktopDropTargetWin takes care of managing drag and drop for
 // DesktopRootWindowHostWin. It converts Windows OLE drop messages into
 // aura::client::DragDropDelegate calls.
 class DesktopDropTargetWin : public ui::DropTargetWin,
                              public aura::WindowObserver {
  public:
-  DesktopDropTargetWin(aura::RootWindow* root_window, HWND window);
+  DesktopDropTargetWin(aura::Window* root_window, HWND window);
   virtual ~DesktopDropTargetWin();
 
  private:
   // ui::DropTargetWin implementation:
   virtual DWORD OnDragEnter(IDataObject* data_object,
                             DWORD key_state,
                             POINT position,
                             DWORD effect) OVERRIDE;
   virtual DWORD OnDragOver(IDataObject* data_object,
                            DWORD key_state,
@@ skipping 14 matching lines @@
                  DWORD key_state,
                  POINT cursor_position,
                  DWORD effect,
                  scoped_ptr<ui::OSExchangeData>* data,
                  scoped_ptr<ui::DropTargetEvent>* event,
                  aura::client::DragDropDelegate** delegate);
 
   void NotifyDragLeave();
 
   // The root window associated with this drop target.
-  aura::RootWindow* root_window_;
+  aura::Window* root_window_;
 
   // The Aura window that is currently under the cursor. We need to manually
   // keep track of this because Windows will only call our drag enter method
   // once when the user enters the associated HWND. But inside that HWND there
   // could be multiple aura windows, so we need to generate drag enter events
   // for them.
   aura::Window* target_window_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopDropTargetWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTIOP_DROP_TARGET_WIN_H_