Rename "service_unittests" -> "services_unittests".

BUILD.gn

 # Copyright (c) 2013 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 the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 159 matching lines @@
       "//media/capture:capture_unittests",
       "//media/cast:cast_unittests",
       "//media/midi:midi_unittests",
       "//media/mojo:media_mojo_unittests",
       "//mojo",
       "//mojo/common:mojo_common_unittests",
       "//mojo/edk/system:mojo_system_unittests",
       "//mojo/edk/test:mojo_public_bindings_unittests",
       "//mojo/edk/test:mojo_public_system_unittests",
       "//net:net_perftests",
-      "//services:service_unittests",
+      "//services:services_unittests",
       "//services/service_manager/public/cpp",
       "//storage:storage_unittests",
       "//third_party/WebKit/Source/platform:blink_platform_unittests",
       "//third_party/WebKit/Source/platform/heap:blink_heap_unittests",
       "//third_party/WebKit/Source/platform/wtf:wtf_unittests",
       "//third_party/WebKit/Source/web:webkit_unit_tests",
       "//third_party/angle/src/tests:angle_end2end_tests",
       "//third_party/angle/src/tests:angle_unittests",
       "//third_party/angle/src/tests:angle_white_box_tests",
       "//third_party/catapult/telemetry:bitmaptools($host_toolchain)",
@@ skipping 868 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }