Remove custom signatures from V8 bindings

Source/bindings/v8/custom/V8MessageEventCustom.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 88 matching lines @@
 
 void V8MessageEvent::initMessageEventMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     MessageEvent* event = V8MessageEvent::toNative(info.Holder());
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, typeArg, info[0]);
     V8TRYCATCH_VOID(bool, canBubbleArg, info[1]->BooleanValue());
     V8TRYCATCH_VOID(bool, cancelableArg, info[2]->BooleanValue());
     v8::Handle<v8::Value> dataArg = info[3];
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, originArg, info[4]);
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, lastEventIdArg, info[5]);
-
-    DOMWindow* sourceArg = 0;
-    if (info[6]->IsObject()) {
-        v8::Handle<v8::Object> wrapper = v8::Handle<v8::Object>::Cast(info[6]);
-        v8::Handle<v8::Object> window = wrapper->FindInstanceInPrototypeChain(V8Window::domTemplate(info.GetIsolate(), worldTypeInMainThread(info.GetIsolate())));
-        if (!window.IsEmpty())
-            sourceArg = V8Window::toNative(window);
-    }
+    DOMWindow* sourceArg = toNativeDOMWindow(info[6], info.GetIsolate());
     OwnPtr<MessagePortArray> portArray;
-
     const int portArrayIndex = 7;
     if (!isUndefinedOrNull(info[portArrayIndex])) {
         portArray = adoptPtr(new MessagePortArray);
         if (!getMessagePortArray(info[portArrayIndex], portArrayIndex + 1, *portArray, info.GetIsolate()))
             return;
     }
     event->initMessageEvent(typeArg, canBubbleArg, cancelableArg, originArg, lastEventIdArg, sourceArg, portArray.release());
 
     if (!dataArg.IsEmpty()) {
         info.Holder()->SetHiddenValue(V8HiddenPropertyName::data(info.GetIsolate()), dataArg);
         if (isolatedWorldForIsolate(info.GetIsolate()))
             event->setSerializedData(SerializedScriptValue::createAndSwallowExceptions(dataArg, info.GetIsolate()));
     }
 }
 
 void V8MessageEvent::webkitInitMessageEventMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     initMessageEventMethodCustom(info);
 }
 
 
 } // namespace WebCore