[Bindings] Move and remove some private symbols from V8HiddenValue

third_party/WebKit/Source/modules/fetch/Request.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.
 
 #include "modules/fetch/Request.h"
 
 #include "bindings/core/v8/Dictionary.h"
+#include "bindings/core/v8/V8PrivateProperty.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/loader/ThreadableLoader.h"
 #include "modules/fetch/BodyStreamBuffer.h"
 #include "modules/fetch/FetchManager.h"
 #include "modules/fetch/RequestInit.h"
 #include "platform/HTTPNames.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/loader/fetch/FetchUtils.h"
 #include "platform/loader/fetch/ResourceLoaderOptions.h"
@@ skipping 703 matching lines @@
   v8::Local<v8::Value> bodyBuffer = ToV8(this->bodyBuffer(), scriptState);
   v8::Local<v8::Value> request = ToV8(this, scriptState);
   if (request.IsEmpty()) {
     // |toV8| can return an empty handle when the worker is terminating.
     // We don't want the renderer to crash in such cases.
     // TODO(yhirano): Delete this block after the graceful shutdown
     // mechanism is introduced.
     return;
   }
   DCHECK(request->IsObject());
-  V8HiddenValue::setHiddenValue(
-      scriptState, request.As<v8::Object>(),
-      V8HiddenValue::internalBodyBuffer(scriptState->isolate()), bodyBuffer);
+  V8PrivateProperty::getInternalBodyBuffer(scriptState->isolate())
+      .set(request.As<v8::Object>(), bodyBuffer);
 }
 
 DEFINE_TRACE(Request) {
   Body::trace(visitor);
   visitor->trace(m_request);
   visitor->trace(m_headers);
 }
 
 }  // namespace blink