Handle v8::MicrotasksScope in the main process

atom/common/api/event_emitter_caller.cc

@@ -16,11 +16,8 @@ v8::Local<v8::Value> CallEmitWithArgs(v8::Isolate* isolate,
                                       v8::Local<v8::Object> obj,
                                       ValueVector* args) {
   // Perform microtask checkpoint after running JavaScript.
-  std::unique_ptr<v8::MicrotasksScope> script_scope(
-      Locker::IsBrowserProcess() ?
-          nullptr :
-          new v8::MicrotasksScope(isolate,
-                                  v8::MicrotasksScope::kRunMicrotasks));
+  v8::MicrotasksScope script_scope(
+      isolate, v8::MicrotasksScope::kRunMicrotasks);
   // Use node::MakeCallback to call the callback, and it will also run pending
   // tasks in Node.js.
   return node::MakeCallback(