Remove leftover code

Author: knopp

shell/platform/darwin/macos/framework/Source/FlutterSurfaceManager.mm

@@ -250,7 +250,6 @@ - (void)presentSurfaces:(NSArray<FlutterSurfacePresentInfo*>*)surfaces
     CFTimeInterval minPresentationTime = (presentationTime + _lastPresentationTime) / 2.0;
     CFTimeInterval now = CACurrentMediaTime();
     if (now < minPresentationTime) {
-      // [NSThread sleepForTimeInterval:minPresentationTime - now];
       NSTimer* timer = [NSTimer timerWithTimeInterval:minPresentationTime - now
                                               repeats:NO
                                                 block:^(NSTimer* timer) {