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

ui/base/dragdrop/drop_target_event.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/dragdrop/drop_target_event.h"
 
 #include "ui/events/event_utils.h"
 
 namespace ui {
 
 ////////////////////////////////////////////////////////////////////////////////
 // DropTargetEvent
 
 DropTargetEvent::DropTargetEvent(const OSExchangeData& data,
-                                 const gfx::Point& location,
-                                 const gfx::Point& root_location,
+                                 const gfx::PointF& location,
+                                 const gfx::PointF& root_location,
                                  int source_operations)
     : LocatedEvent(ET_DROP_TARGET_EVENT,
                    location,
                    root_location,
                    EventTimeForNow(),
                    0),
       data_(data),
-      source_operations_(source_operations) {
-}
+      source_operations_(source_operations) {}
 
 }  // namespace ui