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

ui/base/dragdrop/drop_target_event.h

Index: ui/base/dragdrop/drop_target_event.h
diff --git a/ui/base/dragdrop/drop_target_event.h b/ui/base/dragdrop/drop_target_event.h
index 27aabcd54f66c26fec685605846dd6885ac045d5..18c0630f52fad66854cd43a0014c9cf55bdab52b 100644
--- a/ui/base/dragdrop/drop_target_event.h
+++ b/ui/base/dragdrop/drop_target_event.h
@@ -13,8 +13,8 @@ namespace ui {
 class UI_BASE_EXPORT DropTargetEvent : public LocatedEvent {
  public:
   DropTargetEvent(const OSExchangeData& data,
-                  const gfx::PointF& location,
-                  const gfx::PointF& root_location,
+                  const gfx::Point& location,
+                  const gfx::Point& root_location,
                   int source_operations);
 
   const OSExchangeData& data() const { return data_; }