Rename "service_unittests" -> "services_unittests".

services/BUILD.gn

Index: services/BUILD.gn
diff --git a/services/BUILD.gn b/services/BUILD.gn
index 558ecc2a285a15b3c5b39f2ff5b41b9e12256eeb..410c4595a266cd82c908a91a4878cd6c5b66f755 100644
--- a/services/BUILD.gn
+++ b/services/BUILD.gn
@@ -13,8 +13,8 @@ import("//testing/test.gni")
 # To add tests for a new service, please define a "tests" source_set in the
 # service subdirectory and add it as a dependency here. If your unit tests
 # use the ServiceTest framework, you must also include corresponding catalog
-# entries in the "service_unittests_catalog" target below.
-service_test("service_unittests") {
+# entries in the "services_unittests_catalog" target below.
+service_test("services_unittests") {
   deps = [
     "//services/data_decoder:tests",
     "//services/device:tests",
@@ -63,10 +63,10 @@ service_test("service_unittests") {
 
   test_runner = "//services/test:run_all_service_tests"
 
-  catalog = ":service_unittests_catalog"
+  catalog = ":services_unittests_catalog"
 }
 
-catalog("service_unittests_catalog") {
+catalog("services_unittests_catalog") {
   testonly = true
   catalog_deps = [
     "//services/device:tests_catalog",