Rename mojo_application GN templates to service*

services/shell/background/tests/BUILD.gn

Index: services/shell/background/tests/BUILD.gn
diff --git a/services/shell/background/tests/BUILD.gn b/services/shell/background/tests/BUILD.gn
index 1982e53f968ff69d326ed4998847063b1f2f7c0a..0374b7956574c34e3e2e03768fd572c61f57eebb 100644
--- a/services/shell/background/tests/BUILD.gn
+++ b/services/shell/background/tests/BUILD.gn
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//mojo/public/mojo_application.gni")
+import("//services/shell/public/cpp/service.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
@@ -49,7 +49,7 @@ mojom("test_app_bindings") {
   use_new_wrapper_types = false
 }
 
-mojo_native_application("test_app") {
+service("test_app") {
   output_name = "background_shell_test_app"
 
   sources = [