[WIP] Add SpeechSynthesisErrorevent

Source/modules/speech/SpeechSynthesisEvent.h

 /*
  * Copyright (C) 2013 Apple 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 13 matching lines @@
  */
 
 #ifndef SpeechSynthesisEvent_h
 #define SpeechSynthesisEvent_h
 
 #include "modules/EventModules.h"
 #include "modules/speech/SpeechSynthesisUtterance.h"
 
 namespace blink {
 
-class SpeechSynthesisEvent final : public Event {
+class SpeechSynthesisEvent : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> create();
     static PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> create(const AtomicString& type, SpeechSynthesisUtterance*, unsigned charIndex, float elapsedTime, const String& name);
 
     SpeechSynthesisUtterance* utterance() const { return m_utterance; }
     unsigned charIndex() const { return m_charIndex; }
     float elapsedTime() const { return m_elapsedTime; }
     const String& name() const { return m_name; }
 
     virtual const AtomicString& interfaceName() const override { return EventNames::SpeechSynthesisEvent; }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     SpeechSynthesisEvent();
     SpeechSynthesisEvent(const AtomicString& type, SpeechSynthesisUtterance*, unsigned charIndex, float elapsedTime, const String& name);
 
     PersistentWillBeMember<SpeechSynthesisUtterance> m_utterance;
     unsigned m_charIndex;
     float m_elapsedTime;
     String m_name;
 };
 
 } // namespace blink
 
 #endif // SpeechSynthesisEvent_h