Remove abstract Clone and Cancel methods from MotionEvent

ui/events/test/mock_motion_event.h

Index: ui/events/test/mock_motion_event.h
diff --git a/ui/events/test/mock_motion_event.h b/ui/events/test/mock_motion_event.h
index d04d7154eab7f90b0ee13541d4951cc83519e666..fe7faa88c93376c099daaf24269e3bc74f50ec75 100644
--- a/ui/events/test/mock_motion_event.h
+++ b/ui/events/test/mock_motion_event.h
@@ -39,10 +39,6 @@ struct MockMotionEvent : public MotionEventGeneric {
 
   ~MockMotionEvent() override;
 
-  // MotionEvent methods.
-  scoped_ptr<MotionEvent> Clone() const override;
-  scoped_ptr<MotionEvent> Cancel() const override;
-
   // Utility methods.
   void PressPoint(float x, float y);
   void MovePoint(size_t index, float x, float y);