Convert Aura to use ui::Event.

ui/aura/root_window_host_delegate.h

Index: ui/aura/root_window_host_delegate.h
===================================================================
--- ui/aura/root_window_host_delegate.h	(revision 150582)
+++ ui/aura/root_window_host_delegate.h	(working copy)
@@ -9,22 +9,25 @@
 class Size;
 }
 
-namespace aura {
-
+namespace ui {
 class KeyEvent;
 class MouseEvent;
-class RootWindow;
 class ScrollEvent;
-class TouchEvent;
+class TouchEventImpl;
+}
 
+namespace aura {
+
+class RootWindow;
+
 // 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;