Include Event.h in fewer header files

Source/core/svg/animation/SVGSMILElement.cpp

 /*
  * Copyright (C) 2008 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 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/svg/animation/SVGSMILElement.h"
 
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "bindings/v8/ScriptEventListener.h"
 #include "core/XLinkNames.h"
 #include "core/dom/Document.h"
+#include "core/events/Event.h"
 #include "core/events/EventListener.h"
 #include "core/events/EventSender.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGSVGElement.h"
 #include "core/svg/SVGURIReference.h"
 #include "core/svg/animation/SMILTimeContainer.h"
 #include "platform/FloatConversion.h"
 #include "wtf/MathExtras.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
@@ skipping 1300 matching lines @@
 void SVGSMILElement::trace(Visitor* visitor)
 {
     visitor->trace(m_targetElement);
     visitor->trace(m_timeContainer);
     visitor->trace(m_conditions);
     visitor->trace(m_syncBaseDependents);
     SVGElement::trace(visitor);
 }
 
 }