Clean up WTH creation

mojo/views/native_widget_view_manager.h

 // Copyright 2014 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 MOJO_VIEWS_NATIVE_WIDGET_VIEW_MANAGER_H_
 #define MOJO_VIEWS_NATIVE_WIDGET_VIEW_MANAGER_H_
 
 #include "mojo/aura/window_tree_host_mojo_delegate.h"
+#include "mojo/services/public/cpp/view_manager/node_observer.h"
 #include "mojo/services/public/cpp/view_manager/view_observer.h"
 #include "ui/views/widget/native_widget_aura.h"
 
 namespace ui {
 namespace internal {
 class InputMethodDelegate;
 }
 }
 
 namespace wm {
 class FocusController;
 }
 
 namespace mojo {
 
 class WindowTreeHostMojo;
 
 class NativeWidgetViewManager : public views::NativeWidgetAura,
                                 public WindowTreeHostMojoDelegate,
-                                public view_manager::ViewObserver {
+                                public view_manager::ViewObserver,
+                                public view_manager::NodeObserver {
  public:
   NativeWidgetViewManager(views::internal::NativeWidgetDelegate* delegate,
-                          view_manager::View* view);
+                          view_manager::Node* node);
   virtual ~NativeWidgetViewManager();
 
  private:
   // Overridden from internal::NativeWidgetPrivate:
   virtual void InitNativeWidget(
       const views::Widget::InitParams& in_params) OVERRIDE;
 
   // WindowTreeHostMojoDelegate:
   virtual void CompositorContentsChanged(const SkBitmap& bitmap) OVERRIDE;
 
   // view_manager::ViewObserver
   virtual void OnViewInputEvent(view_manager::View* view,
                                 const EventPtr& event) OVERRIDE;
 
   scoped_ptr<WindowTreeHostMojo> window_tree_host_;
 
   scoped_ptr<wm::FocusController> focus_client_;
 
   scoped_ptr<ui::internal::InputMethodDelegate> ime_filter_;
 
-  view_manager::View* view_;
+  view_manager::Node* node_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetViewManager);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_VIEWS_NATIVE_WIDGET_VIEW_MANAGER_H_