Oilpan: Remove ref counting from EventTarget and all uses of Pass/RefPtr<EventTarget>.

Source/core/events/WindowEventContext.h

 /*
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
 class WindowEventContext {
 public:
     WindowEventContext(Event*, PassRefPtrWillBeRawPtr<Node>, const NodeEventContext*);
 
     DOMWindow* window() const;
     EventTarget* target() const;
     bool handleLocalEvents(Event* event);
 
 private:
     RefPtrWillBePersistent<DOMWindow> m_window;
-    RefPtr<EventTarget> m_target;
+    RefPtrWillBePersistent<EventTarget> m_target;
 };
 
 inline DOMWindow* WindowEventContext::window() const
 {
     return m_window.get();
 }
 
 inline EventTarget* WindowEventContext::target() const
 {
     return m_target.get();
 }
 
 }
 
 #endif // WindowEventContext_h