[bindings] Include V8HiddenValue only if attribute has CachedAttribute or marked keep alive for GC.

Source/bindings/tests/results/core/V8TestInterface3.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 "V8TestInterface3.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/V8DOMConfiguration.h"
 #include "bindings/core/v8/V8Document.h"
-#include "bindings/core/v8/V8HiddenValue.h"
 #include "bindings/core/v8/V8Iterator.h"
 #include "bindings/core/v8/V8Node.h"
 #include "bindings/core/v8/V8ObjectConstructor.h"
 #include "bindings/tests/idls/core/TestPartialInterface4.h"
 #include "core/dom/ContextFeatures.h"
 #include "core/dom/Document.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
 #include "wtf/GetPtr.h"
 #include "wtf/RefPtr.h"
@@ skipping 326 matching lines @@
 {
     scriptWrappable->toImpl<TestInterface3>()->ref();
 }
 
 void V8TestInterface3::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestInterface3>()->deref();
 }
 
 } // namespace blink