Have Frame::loader() return a reference

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 247 matching lines @@
     if ((m_dragDestinationAction & DragDestinationActionEdit) && concludeEditDrag(dragData)) {
         m_documentUnderMouse = 0;
         return true;
     }
 
     m_documentUnderMouse = 0;
 
     if (operationForLoad(dragData) == DragOperationNone)
         return false;
 
-    m_page->mainFrame()->loader()->load(FrameLoadRequest(0, ResourceRequest(dragData->asURL())));
+    m_page->mainFrame()->loader().load(FrameLoadRequest(0, ResourceRequest(dragData->asURL())));
     return true;
 }
 
 void DragController::mouseMovedIntoDocument(Document* newDocument)
 {
     if (m_documentUnderMouse == newDocument)
         return;
 
     // If we were over another document clear the selection
     if (m_documentUnderMouse)
@@ skipping 647 matching lines @@
     return false;
 #endif
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore