Bindings generation emits (more) correct null checking

Source/bindings/dart/custom/DartFormDataCustom.cpp

Index: Source/bindings/dart/custom/DartFormDataCustom.cpp
diff --git a/Source/bindings/dart/custom/DartFormDataCustom.cpp b/Source/bindings/dart/custom/DartFormDataCustom.cpp
index 79646abec4e9edbf3306fd0f387f7af5b45930f7..3566608307d49ef9f74567f0b23cf78c42e56754 100644
--- a/Source/bindings/dart/custom/DartFormDataCustom.cpp
+++ b/Source/bindings/dart/custom/DartFormDataCustom.cpp
@@ -37,26 +37,6 @@ namespace WebCore {
 
 namespace DartFormDataInternal {
 
-void constructorCallback(Dart_NativeArguments args)
-{
-    Dart_Handle exception = 0;
-    {
-        HTMLFormElement* form = 0;
-        if (!Dart_IsNull(Dart_GetNativeArgument(args, 0))) {
-            form = DartHTMLFormElement::toNative(Dart_GetNativeArgument(args, 0), exception);
-            if (exception)
-                goto fail;
-        }
-
-        DartDOMWrapper::returnToDart<DartFormData>(args, DOMFormData::create(form));
-        return;
-    }
-
-fail:
-    Dart_ThrowException(exception);
-    ASSERT_NOT_REACHED();
-}
-
 void appendCallback(Dart_NativeArguments args)
 {
     Dart_Handle exception = 0;
@@ -80,7 +60,7 @@ void appendCallback(Dart_NativeArguments args)
             return;
         }
 
-        Blob* blob = DartBlob::toNative(arg2, exception);
+        Blob* blob = DartBlob::toNativeWithNullCheck(arg2, exception);
         if (exception)
             goto fail;