Mojo: Make the TestService quit when there are no more connections.

mojo/mojo_services.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_echo_bindings',
       'type': 'static_library',
       'sources': [
         'services/dbus_echo/echo.mojom',
       ],
       'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
@@ skipping 339 matching lines @@
         '../base/base.gyp:base',
         'mojo_application',
         'mojo_environment_standalone',
         'mojo_test_service_bindings',
         'mojo_system',
         'mojo_utility',
       ],
       'sources': [
         'public/cpp/application/lib/mojo_main_standalone.cc',
         'services/test_service/test_service_application.cc',
+        'services/test_service/test_service_application.h',
         'services/test_service/test_service_impl.cc',
         'services/test_service/test_service_impl.h',
       ],
     },
   ],
   'conditions': [
     ['use_aura==1', {
       'targets': [
         {
           'target_name': 'mojo_view_manager',
@@ skipping 123 matching lines @@
             'mojo_system_impl',
           ],
           'sources': [
             'services/dbus_echo/dbus_echo_service.cc',
           ],
         },
       ],
     }],
   ],
 }