aura: Use EventPrcessor interface for dispatching touch events.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index 32893ec838d06211871bf36db77231425964f54d..218d83ad31d1b4cf90a7380dd5464e54f76891f5 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -304,8 +304,6 @@ class AURA_EXPORT RootWindow : public ui::EventProcessor,
   ui::EventDispatchDetails DispatchMouseEventToTarget(ui::MouseEvent* event,
                                                       Window* target)
       WARN_UNUSED_RESULT;
-  ui::EventDispatchDetails DispatchTouchEventImpl(ui::TouchEvent* event)
-      WARN_UNUSED_RESULT;
   ui::EventDispatchDetails DispatchHeldEvents() WARN_UNUSED_RESULT;
   // Creates and dispatches synthesized mouse move event using the
   // current mouse location.
@@ -318,6 +316,7 @@ class AURA_EXPORT RootWindow : public ui::EventProcessor,
   void PostMouseMoveEventAfterWindowChange();
 
   void PreDispatchLocatedEvent(Window* target, ui::LocatedEvent* event);
+  void PreDispatchTouchEvent(Window* target, ui::TouchEvent* event);
 
   // TODO(beng): evaluate the ideal ownership model.
   scoped_ptr<Window> window_;