root/chrome/browser/ui/extensions/

1. application_launch.cc
2. application_launch.h
3. extension_enable_flow.cc
4. extension_enable_flow.h
5. extension_enable_flow_delegate.h
6. extension_install_ui_default.cc
7. extension_install_ui_default.h
8. extension_installed_bubble.cc
9. extension_installed_bubble.h