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

Source/bindings/tests/results/core/V8TestInterfaceConstructor4.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 "V8TestInterfaceConstructor4.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 30 matching lines @@
     v8::Local<v8::Object> wrapper = info.Holder();
     impl->associateWithWrapper(info.GetIsolate(), &V8TestInterfaceConstructor4::wrapperTypeInfo, wrapper);
     v8SetReturnValue(info, wrapper);
 }
 
 static void constructor2(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "TestInterfaceConstructor4", info.Holder(), info.GetIsolate());
     V8StringResource<> usvStringArg;
     {
-        TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(usvStringArg, toUSVString(info[0], exceptionState), exceptionState);
+        TONATIVE_CONVERT(convertAndThrow(usvStringArg = toUSVString(info[0], exceptionState), exceptionState), return);
     }
     RefPtr<TestInterfaceConstructor4> impl = TestInterfaceConstructor4::create(usvStringArg);
     v8::Local<v8::Object> wrapper = info.Holder();
     impl->associateWithWrapper(info.GetIsolate(), &V8TestInterfaceConstructor4::wrapperTypeInfo, wrapper);
     v8SetReturnValue(info, wrapper);
 }
 
 static void constructor(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "TestInterfaceConstructor4", info.Holder(), info.GetIsolate());
@@ skipping 79 matching lines @@
 {
     scriptWrappable->toImpl<TestInterfaceConstructor4>()->ref();
 }
 
 void V8TestInterfaceConstructor4::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestInterfaceConstructor4>()->deref();
 }
 
 } // namespace blink