gfx: Make conversions from gfx::Point to PointF explicit.

ui/chromeos/touch_exploration_controller.h

Index: ui/chromeos/touch_exploration_controller.h
diff --git a/ui/chromeos/touch_exploration_controller.h b/ui/chromeos/touch_exploration_controller.h
index 96a77989eed7b35d860c4e9e42b94459a92db094..4872c2d104dcf91c40199fc3fc7239967a8867a1 100644
--- a/ui/chromeos/touch_exploration_controller.h
+++ b/ui/chromeos/touch_exploration_controller.h
@@ -258,8 +258,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
   // Binds DispatchKeyWithFlags to a specific key and flags.
   base::Closure BindKeyEventWithFlags(const ui::KeyboardCode key, int flags);
 
-  scoped_ptr<ui::Event> CreateMouseMoveEvent(const gfx::PointF& location,
-                                             int flags);
+  scoped_ptr<ui::MouseEvent> CreateMouseMoveEvent(const gfx::PointF& location,
+                                                  int flags);
 
   void EnterTouchToMouseMode();