Get rid of {Run,Terminate}MainApplication(), and more ApplicationDelegate conversion.

services/test_service/test_request_tracker_application.cc

Index: services/test_service/test_request_tracker_application.cc
diff --git a/services/test_service/test_request_tracker_application.cc b/services/test_service/test_request_tracker_application.cc
index 856142f522465dfd11e7de6013f0e515a2d9fc74..9a0f6122416713b0a5d32f597f9bd103a980b6c6 100644
--- a/services/test_service/test_request_tracker_application.cc
+++ b/services/test_service/test_request_tracker_application.cc
@@ -43,5 +43,5 @@ bool TestRequestTrackerApplication::OnAcceptConnection(
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::test::TestRequestTrackerApplication app;
-  return mojo::RunMainApplication(application_request, &app);
+  return mojo::RunApplication(application_request, &app);
 }