Inherit EventTarget interface instead of duplicating its code

Source/bindings/v8/CustomElementHelpers.h

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CustomElementHelpers_h
 #define CustomElementHelpers_h
 
+#include "V8Element.h"
 #include "bindings/v8/DOMDataStore.h"
 #include "core/dom/Element.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class HTMLElement;
 class SVGElement;
 
 class CustomElementHelpers {
@@ skipping 25 matching lines @@
     static v8::Handle<v8::Object> wrap(Element*, v8::Handle<v8::Object> creationContext, v8::Isolate*, const CreateWrapperFunction& createTypeExtensionUpgradeCandidateWrapper);
 
 private:
     static v8::Handle<v8::Object> createWrapper(PassRefPtr<Element>, v8::Handle<v8::Object>, v8::Isolate*, const CreateWrapperFunction& createTypeExtensionUpgradeCandidateWrapper);
     static v8::Handle<v8::Object> createUpgradeCandidateWrapper(PassRefPtr<Element>, v8::Handle<v8::Object> creationContext, v8::Isolate*, const CreateWrapperFunction& createTypeExtensionUpgradeCandidateWrapper);
 };
 
 inline v8::Handle<v8::Object> CustomElementHelpers::wrap(Element* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate, const CreateWrapperFunction& createWrapper)
 {
     ASSERT(impl);
-    ASSERT(DOMDataStore::getWrapper(impl, isolate).IsEmpty());
+    ASSERT(DOMDataStore::getWrapper<V8Element>(impl, isolate).IsEmpty());
     return CustomElementHelpers::createWrapper(impl, creationContext, isolate, createWrapper);
 }
 
 } // namespace WebCore
 
 #endif // CustomElementHelpers_h