move constructors to new style callbacks

Source/bindings/v8/custom/V8MutationObserverCustom.cpp

 /*
  * Copyright (C) 2011 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 23 matching lines @@
 
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/V8DOMWrapper.h"
 #include "bindings/v8/V8MutationCallback.h"
 #include "bindings/v8/V8Utilities.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/MutationObserver.h"
 
 namespace WebCore {
 
-v8::Handle<v8::Value> V8MutationObserver::constructorCustom(const v8::Arguments& args)
+void V8MutationObserver::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
-    if (args.Length() < 1)
-        return throwNotEnoughArgumentsError(args.GetIsolate());
+    if (args.Length() < 1) {
+        throwNotEnoughArgumentsError(args.GetIsolate());
+        return;
+    }
 
     v8::Local<v8::Value> arg = args[0];
-    if (!arg->IsFunction())
-        return throwTypeError("Callback argument must be a function", args.GetIsolate());
+    if (!arg->IsFunction()) {
+        throwTypeError("Callback argument must be a function", args.GetIsolate());
+        return;
+    }
 
     ScriptExecutionContext* context = getScriptExecutionContext();
     v8::Handle<v8::Object> wrapper = args.Holder();
 
     RefPtr<MutationCallback> callback = V8MutationCallback::create(v8::Handle<v8::Function>::Cast(arg), context, wrapper, args.GetIsolate());
     RefPtr<MutationObserver> observer = MutationObserver::create(callback.release());
 
     V8DOMWrapper::associateObjectWithWrapper(observer.release(), &info, wrapper, args.GetIsolate(), WrapperConfiguration::Dependent);
-    return wrapper;
+    args.GetReturnValue().Set(wrapper);
 }
 
 } // namespace WebCore