root/chrome/browser/extensions/api/preference/

[..]
  1. chrome_direct_setting.cc
  2. chrome_direct_setting.h
  3. chrome_direct_setting_api.cc
  4. chrome_direct_setting_api.h
  5. preference_api.cc
  6. preference_api.h
  7. preference_api_constants.cc
  8. preference_api_constants.h
  9. preference_api_prefs_unittest.cc
  10. preference_apitest.cc
  11. preference_helpers.cc
  12. preference_helpers.h
[..]