Use newly added Dart_New for wrappers instantiation.

Source/WebCore/bindings/dart/DartDOMWrapper.cpp

 // Copyright 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 28 matching lines @@
 #include "HTMLFormControlElement.h"
 #include "LabelableElement.h"
 
 #include <stdio.h>
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 Dart_Handle DartDOMWrapper::instantiateWrapper(const char* className)
 {
-    // FIXME: this all is very ugly, but we're blocked by API here.
-    // In this case we need an API to invoke ctor, or even better,
-    // create an instance without exposing constructor at all.
-    String factoryMethodName = String("_create") + className;
     Dart_Handle html = DartUtilities::htmlLibraryForCurrentIsolate();
     ASSERT(!Dart_IsError(html));
 
     Dart_Handle cls = Dart_GetClass(html, Dart_NewString(className));
     ASSERT(!Dart_IsError(cls));
 
-    Dart_Handle instance = Dart_Invoke(cls, DartUtilities::stringToDartString(factoryMethodName), 0, 0);
+    Dart_Handle instance = Dart_New(cls, Dart_Null(), 0, 0);
     ASSERT(!Dart_IsError(instance));
+
     return instance;
 }
 
 bool DartDOMWrapper::instanceOf(const char* className, Dart_Handle wrapper)
 {
     // FIXME: Cache classes in the corresponding bindings class. Requires persistent handles.
     Dart_Handle html = DartUtilities::htmlLibraryForCurrentIsolate();
     ASSERT(!Dart_IsError(html));
 
     Dart_Handle cls = Dart_GetClass(html, Dart_NewString(className));
@@ skipping 25 matching lines @@
         DOM_EXCEPTION_INTERFACES_FOR_EACH(TRY_TO_CREATE_EXCEPTION)
     }
 
     ASSERT_NOT_REACHED();
     return Dart_NewString("Unknown WebCore exception");
 }
 
 #undef TRY_TO_CREATE_EXCEPTION
 
 }