Use ui::Event instead of mojom::EventPtr in mus::InputEventHandler.

components/mus/public/cpp/input_event_handler.h

Index: components/mus/public/cpp/input_event_handler.h
diff --git a/components/mus/public/cpp/input_event_handler.h b/components/mus/public/cpp/input_event_handler.h
index 597653ba3d487163b8ad607b19d68ca8f898a6d5..e40e60e31ee969e3f88f25f7a58755ff91562197 100644
--- a/components/mus/public/cpp/input_event_handler.h
+++ b/components/mus/public/cpp/input_event_handler.h
@@ -6,7 +6,11 @@
 #define COMPONENTS_MUS_PUBLIC_CPP_INPUT_EVENT_HANDLER_H_
 
 #include "base/callback_forward.h"
-#include "components/mus/public/interfaces/input_events.mojom.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace ui {
+class Event;
+}
 
 namespace mus {
 
@@ -21,7 +25,7 @@ class InputEventHandler {
   // the callback, then WindowTreeClientImpl will ack the event as not consumed.
   virtual void OnWindowInputEvent(
       Window* target,
-      mojom::EventPtr event,
+      const ui::Event& event,
       scoped_ptr<base::Callback<void(bool)>>* ack_callback) = 0;
 
  protected: