[Bindings] Move and remove some private symbols from V8HiddenValue

third_party/WebKit/Source/modules/fetch/Request.cpp

Index: third_party/WebKit/Source/modules/fetch/Request.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/Request.cpp b/third_party/WebKit/Source/modules/fetch/Request.cpp
index 666857c4d2cfa63055052f5c2b60276572164c31..a89dda7c1b391c8721199d8b581d2eae81156485 100644
--- a/third_party/WebKit/Source/modules/fetch/Request.cpp
+++ b/third_party/WebKit/Source/modules/fetch/Request.cpp
@@ -5,6 +5,7 @@
 #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"
@@ -728,9 +729,8 @@ void Request::refreshBody(ScriptState* scriptState) {
     return;
   }
   DCHECK(request->IsObject());
-  V8HiddenValue::setHiddenValue(
-      scriptState, request.As<v8::Object>(),
-      V8HiddenValue::internalBodyBuffer(scriptState->isolate()), bodyBuffer);
+  V8PrivateProperty::getInternalBodyBuffer(scriptState->isolate())
+      .set(scriptState->context(), request.As<v8::Object>(), bodyBuffer);
 }
 
 DEFINE_TRACE(Request) {