Web MIDI: restore sysex receiving buffer synchronously

media/midi/midi_manager_win.cc

Index: media/midi/midi_manager_win.cc
diff --git a/media/midi/midi_manager_win.cc b/media/midi/midi_manager_win.cc
index de73e138974fe55a49cab2104c405f601cc10ba3..95e2eb652a177064d6f24a043c237777128ce72d 100644
--- a/media/midi/midi_manager_win.cc
+++ b/media/midi/midi_manager_win.cc
@@ -660,9 +660,7 @@ MidiManagerWin::PortManager::HandleMidiInCallback(HMIDIIN hmi,
           &MidiManagerWin::ReceiveMidiData, base::Unretained(manager), index,
           data, manager->port_manager()->CalculateInEventTime(index, param2)));
     }
-    manager->PostTask(base::Bind(&MidiManagerWin::PortManager::RestoreInBuffer,
-                                 base::Unretained(manager->port_manager()),
-                                 index));
+    manager->port_manager()->RestoreInBuffer(index);
   }
 }