Web MIDI: use midi::TaskService in MidiManagerAlsa

media/midi/midi_service.h

Index: media/midi/midi_service.h
diff --git a/media/midi/midi_service.h b/media/midi/midi_service.h
index 37625ad571fe3ce3987a97c32bda60eb0e283d2c..fb84e0a668a70dabfb628ac968bff743cd594c8e 100644
--- a/media/midi/midi_service.h
+++ b/media/midi/midi_service.h
@@ -60,7 +60,7 @@ class MIDI_EXPORT MidiService final {
   scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner(size_t runner_id);
 
   // Obtains a TaskService that lives with MidiService.
-  TaskService* task() { return task_service_.get(); }
+  TaskService* task_service() { return task_service_.get(); }
 
  private:
   // Holds MidiManager instance. If the dynamic instantiation feature is