[Bindings] Replace V8HiddenValue in generated code with V8PrivateProperty

third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl

Index: third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
diff --git a/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl b/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
index 88c099f63f39b47f318a4bdd583965cf3b558540..50476cbe9b8be4177b454701976b88aceaf4bafc 100644
--- a/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
+++ b/third_party/WebKit/Source/bindings/templates/methods.cpp.tmpl
@@ -534,9 +534,11 @@ static void {{method.name}}OriginSafeMethodGetter{{world_suffix}}(const v8::Prop
     return;
   }
 
-  v8::Local<v8::Value> hiddenValue = V8HiddenValue::getHiddenValue(ScriptState::current(info.GetIsolate()), v8::Local<v8::Object>::Cast(info.Holder()), v8AtomicString(info.GetIsolate(), "{{method.name}}"));
-  if (!hiddenValue.IsEmpty()) {
-    v8SetReturnValue(info, hiddenValue);
+  v8::Local<v8::Value> propertyValue =
+      V8PrivateProperty::createSymbol(info.GetIsolate(), "{{method.name}}")
+      .getOrUndefined(v8::Local<v8::Object>::Cast(info.Holder()));
+  if (!propertyValue->IsUndefined()) {
+    v8SetReturnValue(info, propertyValue);
   }
 }
 {% endmacro %}