Reduce repetitive EventTarget subclassing

Source/core/xml/XMLHttpRequestEventTarget.h

Index: Source/core/xml/XMLHttpRequestEventTarget.h
diff --git a/Source/core/xml/XMLHttpRequestEventTarget.h b/Source/core/xml/XMLHttpRequestEventTarget.h
index af81417ff521bea1b9378503b45bc78a36c9629e..2d027abf1484485f643b687e40a20fe08bf363a8 100644
--- a/Source/core/xml/XMLHttpRequestEventTarget.h
+++ b/Source/core/xml/XMLHttpRequestEventTarget.h
@@ -35,7 +35,7 @@
 
 namespace WebCore {
 
-class XMLHttpRequestEventTarget : public EventTarget {
+class XMLHttpRequestEventTarget : public EventTargetWithInlineData {
 public:
     DEFINE_ATTRIBUTE_EVENT_LISTENER(abort);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
@@ -44,13 +44,6 @@ public:
     DEFINE_ATTRIBUTE_EVENT_LISTENER(loadstart);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(progress);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(timeout);
-
-protected:
-    virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
-    virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
-
-private:
-    EventTargetData m_eventTargetData;
 };
 
 } // namespace WebCore