Structured cloning: improve DataCloneError reporting.

Source/bindings/tests/results/V8TestObjectPython.cpp

 /*
  * Copyright (C) 2013 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 5000 matching lines @@
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, strictTypeCheckingStringArg, info[0]);
     imp->overloadedMethodG(strictTypeCheckingStringArg);
 }
 
 static void overloadedMethodGMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (((info.Length() == 0))) {
         overloadedMethodG1Method(info);
         return;
     }
-    if (((info.Length() == 1) && (info[0]->IsNull() || info[0]->IsUndefined() || info[0]->IsString() || info[0]->IsObject()))) {
+    if (((info.Length() == 1) && (isUndefinedOrNull(info[0]) || info[0]->IsString() || info[0]->IsObject()))) {
         overloadedMethodG2Method(info);
         return;
     }
     throwTypeError(ExceptionMessages::failedToExecute("overloadedMethodG", "TestObjectPython", "No function was found that matched the signature provided."), info.GetIsolate());
 }
 
 static void overloadedMethodGMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMMethod");
     TestObjectPythonV8Internal::overloadedMethodGMethod(info);
@@ skipping 1520 matching lines @@
     fromInternalPointer(object)->deref();
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestObjectPython* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace WebCore