IDL: Drop value conversion (V8 -> C++) macros from generated code

Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.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 "V8TestInterfaceNamedConstructor2.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 33 matching lines @@
     if (ConstructorMode::current(info.GetIsolate()) == ConstructorMode::WrapExistingObject) {
         v8SetReturnValue(info, info.Holder());
         return;
     }
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForConstructor(info.GetIsolate(), "TestInterfaceNamedConstructor2", 1, info.Length()), info.GetIsolate());
         return;
     }
     V8StringResource<> stringArg;
     {
-        TOSTRING_VOID_INTERNAL(stringArg, info[0]);
+        stringArg = info[0];
+        if (!stringArg.prepare())
+            return;
     }
     RefPtr<TestInterfaceNamedConstructor2> impl = TestInterfaceNamedConstructor2::createForJSConstructor(stringArg);
     v8::Local<v8::Object> wrapper = info.Holder();
     impl->associateWithWrapper(info.GetIsolate(), &V8TestInterfaceNamedConstructor2Constructor::wrapperTypeInfo, wrapper);
     v8SetReturnValue(info, wrapper);
 }
 
 v8::Local<v8::FunctionTemplate> V8TestInterfaceNamedConstructor2Constructor::domTemplate(v8::Isolate* isolate)
 {
     static int domTemplateKey; // This address is used for a key to look up the dom template.
@@ skipping 54 matching lines @@
 {
     scriptWrappable->toImpl<TestInterfaceNamedConstructor2>()->ref();
 }
 
 void V8TestInterfaceNamedConstructor2::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestInterfaceNamedConstructor2>()->deref();
 }
 
 } // namespace blink