Convert Aura to use ui::Event.

ui/aura/root_window_host_delegate.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_DELEGATE_H_
 #define UI_AURA_ROOT_WINDOW_HOST_DELEGATE_H_
 
 namespace gfx {
 class Size;
 }
 
+namespace ui {
+class KeyEvent;
+class MouseEvent;
+class ScrollEvent;
+class TouchEventImpl;
+}
+
 namespace aura {
 
-class KeyEvent;
-class MouseEvent;
 class RootWindow;
-class ScrollEvent;
-class TouchEvent;
 
 // A private interface used by RootWindowHost implementations to communicate
 // with their owning RootWindow.
 class AURA_EXPORT RootWindowHostDelegate {
  public:
-  virtual bool OnHostKeyEvent(KeyEvent* event) = 0;
-  virtual bool OnHostMouseEvent(MouseEvent* event) = 0;
-  virtual bool OnHostScrollEvent(ScrollEvent* event) = 0;
-  virtual bool OnHostTouchEvent(TouchEvent* event) = 0;
+  virtual bool OnHostKeyEvent(ui::KeyEvent* event) = 0;
+  virtual bool OnHostMouseEvent(ui::MouseEvent* event) = 0;
+  virtual bool OnHostScrollEvent(ui::ScrollEvent* event) = 0;
+  virtual bool OnHostTouchEvent(ui::TouchEventImpl* event) = 0;
 
   virtual void OnHostLostCapture() = 0;
 
   virtual void OnHostPaint() = 0;
 
   virtual void OnHostResized(const gfx::Size& size) = 0;
 
   virtual float GetDeviceScaleFactor() = 0;
 
   virtual RootWindow* AsRootWindow() = 0;
 
  protected:
   virtual ~RootWindowHostDelegate() {}
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_DELEGATE_H_