bindings: Introduces type-check for the internal pointers.

Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp

Index: Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp b/Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp
index a1b8b8eab79f5f4bc773bee9769bc2b651dab2b0..ecef3748d1b462c97b8f47d3155b0a54288e459c 100644
--- a/Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp
@@ -56,9 +56,9 @@ bool V8ArrayBuffer::hasInstance(v8::Handle<v8::Value> value, v8::Isolate*)
     return value->IsArrayBuffer();
 }
 
-void V8ArrayBuffer::derefObject(void* object)
+void V8ArrayBuffer::derefObject(ScriptWrappableBase* internalPointer)
 {
-    static_cast<ArrayBuffer*>(object)->deref();
+    fromInternalPointer(internalPointer)->deref();
 }
 
 v8::Handle<v8::Object> V8ArrayBuffer::createWrapper(PassRefPtr<ArrayBuffer> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
@@ -79,7 +79,7 @@ ArrayBuffer* V8ArrayBuffer::toNative(v8::Handle<v8::Object> object)
     v8::Local<v8::ArrayBuffer> v8buffer = object.As<v8::ArrayBuffer>();
     if (v8buffer->IsExternal()) {
         RELEASE_ASSERT(toWrapperTypeInfo(object)->ginEmbedder == gin::kEmbedderBlink);
-        return reinterpret_cast<ArrayBuffer*>(blink::toNative(object));
+        return reinterpret_cast<ArrayBuffer*>(blink::toInternalPointer(object));
     }
 
     v8::ArrayBuffer::Contents v8Contents = v8buffer->Externalize();
@@ -88,7 +88,7 @@ ArrayBuffer* V8ArrayBuffer::toNative(v8::Handle<v8::Object> object)
     RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(contents);
     V8DOMWrapper::associateObjectWithWrapper<V8ArrayBuffer>(buffer.release(), &wrapperTypeInfo, object, v8::Isolate::GetCurrent(), WrapperConfiguration::Dependent);
 
-    return reinterpret_cast<ArrayBuffer*>(blink::toNative(object));
+    return reinterpret_cast<ArrayBuffer*>(blink::toInternalPointer(object));
 }
 
 ArrayBuffer* V8ArrayBuffer::toNativeWithTypeCheck(v8::Isolate* isolate, v8::Handle<v8::Value> value)