Add [WillBeGarbageCollected] to Event.idl

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 655 matching lines @@
     void didMergeTextNodes(Text* oldNode, unsigned offset);
     void didSplitTextNode(Text* oldNode);
 
     void clearDOMWindow() { m_domWindow = 0; }
     DOMWindow* domWindow() const { return m_domWindow; }
 
     // Helper functions for forwarding DOMWindow event related tasks to the DOMWindow if it exists.
     void setWindowAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>);
     EventListener* getWindowAttributeEventListener(const AtomicString& eventType);
 
-    PassRefPtr<Event> createEvent(const String& eventType, ExceptionState&);
-    PassRefPtr<Event> createEvent(ExceptionState&);
+    PassRefPtrWillBeRawPtr<Event> createEvent(const String& eventType, ExceptionState&);
+    PassRefPtrWillBeRawPtr<Event> createEvent(ExceptionState&);
 
     // keep track of what types of event listeners are registered, so we don't
     // dispatch events unnecessarily
     enum ListenerType {
         DOMSUBTREEMODIFIED_LISTENER          = 1,
         DOMNODEINSERTED_LISTENER             = 1 << 1,
         DOMNODEREMOVED_LISTENER              = 1 << 2,
         DOMNODEREMOVEDFROMDOCUMENT_LISTENER  = 1 << 3,
         DOMNODEINSERTEDINTODOCUMENT_LISTENER = 1 << 4,
         DOMCHARACTERDATAMODIFIED_LISTENER    = 1 << 5,
@@ skipping 707 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h