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

Source/bindings/tests/results/core/V8TestSpecialOperations.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 "V8TestSpecialOperations.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 27 matching lines @@
 
 static void namedItemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (UNLIKELY(info.Length() < 1)) {
         V8ThrowException::throwException(createMinimumArityTypeErrorForMethod(info.GetIsolate(), "namedItem", "TestSpecialOperations", 1, info.Length()), info.GetIsolate());
         return;
     }
     TestSpecialOperations* impl = V8TestSpecialOperations::toImpl(info.Holder());
     V8StringResource<> name;
     {
-        TOSTRING_VOID_INTERNAL(name, info[0]);
+        TONATIVE_CONVERT((name = info[0]).prepare(), return);
     }
     NodeOrNodeList result;
     impl->getItem(name, result);
     v8SetReturnValue(info, result);
 }
 
 static void namedItemMethodCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMMethod");
     TestSpecialOperationsV8Internal::namedItemMethod(info);
@@ skipping 143 matching lines @@
 {
     scriptWrappable->toImpl<TestSpecialOperations>()->ref();
 }
 
 void V8TestSpecialOperations::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestSpecialOperations>()->deref();
 }
 
 } // namespace blink