Fix a TODO in GN file

services/service_manager/public/cpp/BUILD.gn

-# 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",
     "binder_registry.cc",
     "binder_registry.h",
     "connect.h",
     "connector.cc",
     "connector.h",
     "identity.cc",
     "identity.h",
@@ skipping 41 matching lines @@
       "//mojo/edk/system",
       "//mojo/public/cpp/bindings",
       "//mojo/public/cpp/system",
       "//services/service_manager/background:lib",
       "//services/service_manager/public/interfaces",
     ]
 
     data_deps = []
   }
 }