Reduce repetitive EventTarget subclassing

Source/core/css/FontFaceSet.cpp

 /*
  * 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
@@ skipping 148 matching lines @@
 
 FontFaceSet::~FontFaceSet()
 {
 }
 
 Document* FontFaceSet::document() const
 {
     return toDocument(scriptExecutionContext());
 }
 
-EventTargetData* FontFaceSet::eventTargetData()
-{
-    return &m_eventTargetData;
-}
-
-EventTargetData* FontFaceSet::ensureEventTargetData()
-{
-    return &m_eventTargetData;
-}
-
 const AtomicString& FontFaceSet::interfaceName() const
 {
     return eventNames().interfaceForFontFaceSet;
 }
 
 ScriptExecutionContext* FontFaceSet::scriptExecutionContext() const
 {
     return ActiveDOMObject::scriptExecutionContext();
 }
 
@@ skipping 256 matching lines @@
 
 void FontFaceSet::FontLoadHistogram::record()
 {
     if (m_recorded)
         return;
     m_recorded = true;
     HistogramSupport::histogramCustomCounts("WebFont.WebFontsInPage", m_count, 1, 100, 50);
 }
 
 } // namespace WebCore