Rename "service_unittests" -> "services_unittests".

testing/buildbot/gn_isolate_map.pyl

 ## Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This is a .pyl, or "Python Literal", file. You can treat it just like a
 # .json file, with the following exceptions:
 # * all keys must be quoted (use single quotes, please);
 # * comments are allowed, using '#' syntax; and
 # * trailing commas are allowed.
 
@@ skipping 815 matching lines @@
     "type": "console_test_launcher",
   },
   "service_manager_unittests": {
     "label": "//services/service_manager/tests:service_manager_unittests",
     "type": "console_test_launcher",
   },
   "service_junit_tests": {
     "label": "//services:service_junit_tests",
     "type": "junit_test",
   },
-  "service_unittests": {
-    "label": "//services:service_unittests",
+  "services_unittests": {
+    "label": "//services:services_unittests",
     "type": "windowed_test_launcher",
   },
   "setup_unittests": {
     "label": "//chrome/installer/setup:setup_unittests",
     "type": "console_test_launcher",
   },
   "skia_unittests": {
     "label": "//skia:skia_unittests",
     "type": "console_test_launcher",
   },
@@ skipping 246 matching lines @@
   },
   "wm_unittests": {
     "label": "//ui/wm:wm_unittests",
     "type": "windowed_test_launcher",
   },
   "wtf_unittests": {
     "label": "//third_party/WebKit/Source/platform/wtf:wtf_unittests",
     "type": "console_test_launcher",
   },
 }