Use newly added Dart_New for wrappers instantiation.

Source/WebCore/bindings/dart/DartDOMWrapper.cpp

Index: Source/WebCore/bindings/dart/DartDOMWrapper.cpp
diff --git a/Source/WebCore/bindings/dart/DartDOMWrapper.cpp b/Source/WebCore/bindings/dart/DartDOMWrapper.cpp
index f046b33ccc8245d24d20ebaeece81e5428b3f8d9..417f8a1789015b53b85baf15d796e7773f2cbe80 100644
--- a/Source/WebCore/bindings/dart/DartDOMWrapper.cpp
+++ b/Source/WebCore/bindings/dart/DartDOMWrapper.cpp
@@ -46,18 +46,15 @@ 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;
 }