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

Source/bindings/tests/results/core/V8TestInterfaceEventConstructor.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 "V8TestInterfaceEventConstructor.h"
 
 #include "bindings/core/v8/Dictionary.h"
@@ skipping 219 matching lines @@
 
 static void constructor(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "TestInterfaceEventConstructor", info.Holder(), info.GetIsolate());
     if (info.Length() < 1) {
         exceptionState.throwTypeError("An event name must be provided.");
         exceptionState.throwIfNeeded();
         return;
     }
 
-    TOSTRING_VOID(V8StringResource<>, type, info[0]);
+    V8StringResource<> type(info[0]);
+    if (!type.prepare())
+        return;
     v8::Local<v8::Value> initializedByEventConstructorReadonlyAnyAttribute;
     TestInterfaceEventConstructorInit eventInit;
     if (info.Length() >= 2) {
         Dictionary options(info[1], info.GetIsolate(), exceptionState);
         if (!initializeTestInterfaceEventConstructor(eventInit, options, exceptionState, info)) {
             exceptionState.throwIfNeeded();
             return;
         }
         options.get("initializedByEventConstructorReadonlyAnyAttribute", initializedByEventConstructorReadonlyAnyAttribute);
         if (!initializedByEventConstructorReadonlyAnyAttribute.IsEmpty())
@@ skipping 130 matching lines @@
 }
 
 void V8TestInterfaceEventConstructor::derefObject(ScriptWrappable* scriptWrappable)
 {
 #if !ENABLE(OILPAN)
     scriptWrappable->toImpl<TestInterfaceEventConstructor>()->deref();
 #endif
 }
 
 } // namespace blink