Define gyp targets for mojo/public/* in mojo/public/mojo_public.gyp

mojo/public/cpp/application/tests/BUILD.gn

 # Copyright 2014 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.
 
-# GYP version: mojo/mojo_public_tests.gypi:mojo_public_application_unittests
+# GYP version: mojo/mojo_base.gyp:mojo_public_application_unittests
 test("mojo_public_application_unittests") {
   deps = [
     "//base",
     "//mojo/common/test:run_all_unittests",
     "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/environment:standalone",
     "//mojo/public/cpp/utility",
     "//testing/gtest",
   ]
 
   sources = [ "service_registry_unittest.cc" ]
 }