root/chrome/browser/extensions/api/feedback_private/

[..]
  1. feedback_browsertest.cc
  2. feedback_private_api.cc
  3. feedback_private_api.h
  4. feedback_private_apitest.cc
  5. feedback_service.cc
  6. feedback_service.h
  7. feedback_service_chromeos.cc
  8. feedback_service_nonchromeos.cc
[..]