Extend ScalarValueString handling to include constructors.

Source/bindings/tests/results/V8TestObject.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #include "V8TestObject.h"
 
 #include "HTMLNames.h"
@@ skipping 6970 matching lines @@
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultFalseBooleanArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "V8Execution");
 }
 
 static void voidMethodDefaultNullableStringArgMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestObject* impl = V8TestObject::toNative(info.Holder());
     V8StringResource<> defaultStringArg;
     {
-        TOSTRING_VOID_INTERNAL(defaultStringArg, info[0]);
+        TOSTRING_VOID_INTERNAL(defaultStringArg, argumentOrNull(info, 0));
     }
     impl->voidMethodDefaultNullableStringArg(defaultStringArg);
 }
 
 static void voidMethodDefaultNullableStringArgMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMMethod");
     TestObjectV8Internal::voidMethodDefaultNullableStringArgMethod(info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "V8Execution");
 }
@@ skipping 3104 matching lines @@
     fromInternalPointer(object)->deref();
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestObject* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace WebCore