Move modules-dependent Event code out of core.

Source/modules/mediastream/RTCDTMFToneChangeEvent.h

 /*
  * Copyright (C) 2013 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
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  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 #ifndef RTCDTMFToneChangeEvent_h
 #define RTCDTMFToneChangeEvent_h
 
-#include "core/events/Event.h"
+#include "modules/EventModules.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 struct RTCDTMFToneChangeEventInit : public EventInit {
     String tone;
 };
 
 class RTCDTMFToneChangeEvent FINAL : public Event {
 public:
@@ skipping 13 matching lines @@
     RTCDTMFToneChangeEvent();
     explicit RTCDTMFToneChangeEvent(const String& tone);
     explicit RTCDTMFToneChangeEvent(const RTCDTMFToneChangeEventInit&);
 
     String m_tone;
 };
 
 } // namespace WebCore
 
 #endif // RTCDTMFToneChangeEvent_h