Fix a TODO in GN file

services/service_manager/public/cpp/BUILD.gn

Index: services/service_manager/public/cpp/BUILD.gn
diff --git a/services/service_manager/public/cpp/BUILD.gn b/services/service_manager/public/cpp/BUILD.gn
index ed46e14abc23151d4575f2109d37de6d34df9872..f8444eb130838620112913d545bdb1ff4b882b37 100644
--- a/services/service_manager/public/cpp/BUILD.gn
+++ b/services/service_manager/public/cpp/BUILD.gn
@@ -1,15 +1,8 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
+# Copyright 2017 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.
 
-group("cpp") {
-  public_deps = [
-    ":sources",
-  ]
-}
-
-# TODO(rockot): Rename this to "cpp".
-static_library("sources") {
+static_library("cpp") {
   sources = [
     "bind_source_info.cc",
     "bind_source_info.h",