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

Source/bindings/tests/results/core/V8TestInterfaceEventInit.h

 // 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!
 
 #ifndef V8TestInterfaceEventInit_h
 #define V8TestInterfaceEventInit_h
 
 #include "bindings/core/v8/ToV8.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/tests/idls/core/TestInterfaceEventInit.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ExceptionState;
 
 class V8TestInterfaceEventInit {
 public:
-    static void toImpl(v8::Isolate*, v8::Local<v8::Value>, TestInterfaceEventInit&, ExceptionState&);
+    static bool toImpl(v8::Isolate*, v8::Local<v8::Value>, TestInterfaceEventInit&, ExceptionState&);
 };
 
 v8::Local<v8::Value> toV8(const TestInterfaceEventInit&, v8::Local<v8::Object>, v8::Isolate*);
 void toV8TestInterfaceEventInit(const TestInterfaceEventInit&, v8::Local<v8::Object> dictionary, v8::Local<v8::Object> creationContext, v8::Isolate*);
 
 template<class CallbackInfo>
 inline void v8SetReturnValue(const CallbackInfo& callbackInfo, TestInterfaceEventInit& impl)
 {
     v8SetReturnValue(callbackInfo, toV8(impl, callbackInfo.Holder(), callbackInfo.GetIsolate()));
 }
 
 template <>
 struct NativeValueTraits<TestInterfaceEventInit> {
     static TestInterfaceEventInit nativeValue(const v8::Local<v8::Value>&, v8::Isolate*, ExceptionState&);
 };
 
 } // namespace blink
 
 #endif // V8TestInterfaceEventInit_h