[Content] Update V8ValueConverter::create to return a std::unique_ptr

extensions/renderer/runtime_custom_bindings.cc

Index: extensions/renderer/runtime_custom_bindings.cc
diff --git a/extensions/renderer/runtime_custom_bindings.cc b/extensions/renderer/runtime_custom_bindings.cc
index 66ed982fb558d4d96dabdee457734b7dc22969f8..f95c7e952fea37aecc60e72aa9bba38eed36db3d 100644
--- a/extensions/renderer/runtime_custom_bindings.cc
+++ b/extensions/renderer/runtime_custom_bindings.cc
@@ -38,9 +38,7 @@ void RuntimeCustomBindings::GetManifest(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK(context()->extension());
 
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
-  args.GetReturnValue().Set(converter->ToV8Value(
+  args.GetReturnValue().Set(content::V8ValueConverter::Create()->ToV8Value(
       context()->extension()->manifest()->value(), context()->v8_context()));
 }