Inherit EventTarget interface instead of duplicating its code

Source/bindings/v8/custom/V8ArrayBufferCustom.cpp

 /*
  * Copyright (C) 2009 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 53 matching lines @@
 
 void V8ArrayBuffer::derefObject(void* object)
 {
     static_cast<ArrayBuffer*>(object)->deref();
 }
 
 
 v8::Handle<v8::Object> V8ArrayBuffer::createWrapper(PassRefPtr<ArrayBuffer> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     ASSERT(impl.get());
-    ASSERT(DOMDataStore::getWrapper(impl.get(), isolate).IsEmpty());
+    ASSERT(DOMDataStore::getWrapper<V8ArrayBuffer>(impl.get(), isolate).IsEmpty());
 
     v8::Handle<v8::Object> wrapper = v8::ArrayBuffer::New(impl->data(), impl->byteLength());
     v8::V8::AdjustAmountOfExternalAllocatedMemory(impl->byteLength());
     impl->setDeallocationObserver(V8ArrayBufferDeallocationObserver::instance());
 
-    V8DOMWrapper::associateObjectWithWrapper(impl, &info, wrapper, isolate, WrapperConfiguration::Independent);
+    V8DOMWrapper::associateObjectWithWrapper<V8ArrayBuffer>(impl, &info, wrapper, isolate, WrapperConfiguration::Independent);
     return wrapper;
 }
 
 ArrayBuffer* V8ArrayBuffer::toNative(v8::Handle<v8::Object> object)
 {
     ASSERT(object->IsArrayBuffer());
     void* arraybufferPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
     if (arraybufferPtr)
         return reinterpret_cast<ArrayBuffer*>(arraybufferPtr);
 
     v8::Local<v8::ArrayBuffer> v8buffer = object.As<v8::ArrayBuffer>();
     ASSERT(!v8buffer->IsExternal());
 
     v8::ArrayBuffer::Contents v8Contents = v8buffer->Externalize();
     ArrayBufferContents contents(v8Contents.Data(), v8Contents.ByteLength());
     RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(contents);
     // V8 accounts for external memory even after externalizing the buffer.
     buffer->setDeallocationObserver(V8ArrayBufferDeallocationObserver::instance());
-    V8DOMWrapper::associateObjectWithWrapper(buffer.release(), &info, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Dependent);
+    V8DOMWrapper::associateObjectWithWrapper<V8ArrayBuffer>(buffer.release(), &info, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Dependent);
 
     arraybufferPtr = object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex);
     ASSERT(arraybufferPtr);
     return reinterpret_cast<ArrayBuffer*>(arraybufferPtr);
 }
 
 
 } // namespace WebCore