Merge 105212 - Crash in in WebCore::EventHandler::mouseMoved.

Source/WebCore/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *
  * 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 1538 matching lines @@
 
     RenderLayer* layer = renderer->enclosingLayer();
     if (!layer)
         return 0;
 
     return layer;
 }
 
 bool EventHandler::mouseMoved(const PlatformMouseEvent& event, bool onlyUpdateScrollbars)
 {
+    RefPtr<FrameView> protector(m_frame->view());
+
     HitTestResult hoveredNode = HitTestResult(LayoutPoint());
     bool result = handleMouseMoveEvent(event, &hoveredNode, onlyUpdateScrollbars);
 
     if (onlyUpdateScrollbars)
         return result;
 
     Page* page = m_frame->page();
     if (!page)
         return result;
 
@@ skipping 1761 matching lines @@
     }
 
     return defaultPrevented;
 }
 
 
 
 #endif
 
 }