root/chrome/browser/extensions/api/music_manager_private/

[..]
  1. device_id.cc
  2. device_id.h
  3. device_id_chromeos.cc
  4. device_id_linux.cc
  5. device_id_mac.cc
  6. device_id_win.cc
  7. music_manager_private_api.cc
  8. music_manager_private_api.h
  9. music_manager_private_browsertest.cc
[..]