Make Event RefCountedGarbageCollected and implement trace() methods to the Event hierarcy

Source/core/speech/SpeechInputEvent.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:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
 class SpeechInputEvent FINAL : public Event {
 public:
     static PassRefPtr<SpeechInputEvent> create();
     static PassRefPtr<SpeechInputEvent> create(const AtomicString& eventType, const SpeechInputResultArray& results);
     virtual ~SpeechInputEvent();
 
     SpeechInputResultList* results() const { return m_results.get(); }
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     SpeechInputEvent();
     SpeechInputEvent(const AtomicString& eventType, const SpeechInputResultArray& results);
 
-    RefPtrWillBePersistent<SpeechInputResultList> m_results;
+    RefPtrWillBeMember<SpeechInputResultList> m_results;
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(INPUT_SPEECH)
 
 #endif // SpeechInputEvent_h