Partially revert "[node] Fix memory test hanging after GlyphAtlas refactoring (#8394)"

This reverts commit 5700c99e55.

platform/node/src/node_request.cpp

@@ -122,19 +122,9 @@ void NodeRequest::HandleCallback(const Nan::FunctionCallbackInfo<v8::Value>& inf
 }
 
 void NodeRequest::Execute() {
-    asyncExecute = std::make_unique<mbgl::util::AsyncTask>([this] { doExecute(); Unref(); });
-    asyncExecute->send();
-
-    Ref();
-}
-
-void NodeRequest::doExecute() {
-    Nan::HandleScope scope;
-
     v8::Local<v8::Value> argv[] = { handle() };
 
     Nan::MakeCallback(Nan::To<v8::Object>(target->handle()->GetInternalField(1)).ToLocalChecked(), "request", 1, argv);
-    asyncExecute.reset();
 }
 
 NodeRequest::NodeAsyncRequest::NodeAsyncRequest(NodeRequest* request_) : request(request_) {