IDL: Add support for [TreatNullAs=EmptyString]

Source/bindings/core/v8/custom/V8XMLHttpRequestCustom.cpp

 /*
  * Copyright (C) 2008, 2009, 2010 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 159 matching lines @@
     TOSTRING_VOID(V8StringResource<>, method, info[0]);
     TOSTRING_VOID(V8StringResource<>, urlstring, info[1]);
 
     ExecutionContext* context = currentExecutionContext(info.GetIsolate());
     KURL url = context->completeURL(urlstring);
 
     if (info.Length() >= 3) {
         bool async = info[2]->BooleanValue();
 
         if (info.Length() >= 4 && !info[3]->IsUndefined()) {
-            TOSTRING_VOID(V8StringResource<WithNullCheck>, user, info[3]);
+            TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, user, info[3]);
 
             if (info.Length() >= 5 && !info[4]->IsUndefined()) {
-                TOSTRING_VOID(V8StringResource<WithNullCheck>, password, info[4]);
+                TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, password, info[4]);
                 xmlHttpRequest->open(method, url, async, user, password, exceptionState);
             } else {
                 xmlHttpRequest->open(method, url, async, user, exceptionState);
             }
         } else {
             xmlHttpRequest->open(method, url, async, exceptionState);
         }
     } else {
         xmlHttpRequest->open(method, url, exceptionState);
     }
@@ skipping 39 matching lines @@
             v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(arg);
             ArrayBuffer* arrayBuffer = V8ArrayBuffer::toNative(object);
             ASSERT(arrayBuffer);
             xmlHttpRequest->send(arrayBuffer, exceptionState);
         } else if (V8ArrayBufferView::hasInstance(arg, info.GetIsolate())) {
             v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(arg);
             ArrayBufferView* arrayBufferView = V8ArrayBufferView::toNative(object);
             ASSERT(arrayBufferView);
             xmlHttpRequest->send(arrayBufferView, exceptionState);
         } else {
-            TOSTRING_VOID(V8StringResource<WithNullCheck>, argString, arg);
+            TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, argString, arg);
             xmlHttpRequest->send(argString, exceptionState);
         }
     }
 
     exceptionState.throwIfNeeded();
 }
 
 } // namespace WebCore