Revert the merge. Mac build is mysteriously broken.

third_party/WebKit/WebCore/dom/MouseEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 18 matching lines @@
 
 MouseEvent::MouseEvent()
     : m_button(0)
     , m_buttonDown(false)
 {
 }
 
 MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, PassRefPtr<AbstractView> view,
                        int detail, int screenX, int screenY, int pageX, int pageY,
                        bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
-                       unsigned short button, PassRefPtr<EventTarget> relatedTarget,
+                       unsigned short button, PassRefPtr<EventTargetNode> relatedTarget,
                        PassRefPtr<Clipboard> clipboard, bool isSimulated)
     : MouseRelatedEvent(eventType, canBubble, cancelable, view, detail, screenX, screenY,
                         pageX, pageY, ctrlKey, altKey, shiftKey, metaKey, isSimulated)
     , m_button(button == (unsigned short)-1 ? 0 : button)
     , m_buttonDown(button != (unsigned short)-1)
     , m_relatedTarget(relatedTarget)
     , m_clipboard(clipboard)
 {
 }
 
 MouseEvent::~MouseEvent()
 {
 }
 
 void MouseEvent::initMouseEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<AbstractView> view,
                                 int detail, int screenX, int screenY, int clientX, int clientY,
                                 bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
-                                unsigned short button, PassRefPtr<EventTarget> relatedTarget)
+                                unsigned short button, PassRefPtr<EventTargetNode> relatedTarget)
 {
     if (dispatched())
         return;
 
     initUIEvent(type, canBubble, cancelable, view, detail);
 
     m_screenX = screenX;
     m_screenY = screenY;
     m_ctrlKey = ctrlKey;
     m_altKey = altKey;
@@ skipping 26 matching lines @@
     // For the DOM, the return values for left, middle and right mouse buttons are 0, 1, 2, respectively.
     // For the Netscape "which" property, the return values for left, middle and right mouse buttons are 1, 2, 3, respectively. 
     // So we must add 1.
     return m_button + 1;
 }
 
 Node* MouseEvent::toElement() const
 {
     // MSIE extension - "the object toward which the user is moving the mouse pointer"
     if (type() == eventNames().mouseoutEvent) 
-        return relatedTarget() ? relatedTarget()->toNode() : 0;
+        return relatedTarget();
     
     return target() ? target()->toNode() : 0;
 }
 
 Node* MouseEvent::fromElement() const
 {
     // MSIE extension - "object from which activation or the mouse pointer is exiting during the event" (huh?)
     if (type() != eventNames().mouseoutEvent)
-        return relatedTarget() ? relatedTarget()->toNode() : 0;
+        return relatedTarget();
     
     return target() ? target()->toNode() : 0;
 }
 
 } // namespace WebCore