Fix link error in GYP builds

services/shell/shell.gyp

 # 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.
 
 {
   'targets': [{
     'target_name': 'shell_interfaces',
     'type': 'none',
     'variables': {
       'mojom_files': [
@@ skipping 93 matching lines @@
     ],
   }, {
     'target_name': 'mojo_shell_unittests',
     'type': 'executable',
     'sources': [
       'tests/loader_unittest.cc',
     ],
     'dependencies': [
       'shell_lib',
       'shell_public',
-      'shell_test_interfaces',
+      'shell_test_public',
       '<(DEPTH)/base/base.gyp:base',
       '<(DEPTH)/mojo/mojo_base.gyp:mojo_common_lib',
       '<(DEPTH)/mojo/mojo_base.gyp:mojo_url_type_converters',
       '<(DEPTH)/mojo/mojo_edk.gyp:mojo_run_all_unittests',
       '<(DEPTH)/mojo/mojo_public.gyp:mojo_cpp_bindings',
       '<(DEPTH)/testing/gtest.gyp:gtest',
       '<(DEPTH)/url/url.gyp:url_lib',
     ]
   }, {
+    'target_name': 'shell_test_public',
+    'type': 'static_library',
+    'dependencies': [
+      'shell_test_interfaces',
+    ],
+  }, {
     'target_name': 'shell_test_interfaces',
-    'type': 'static_library',
+    'type': 'none',
     'variables': {
       'mojom_files': [
         'tests/test.mojom',
       ],
     },
     'includes': [
       '../../mojo/mojom_bindings_generator_explicit.gypi',
     ],
   }, {
     'target_name': 'shell_runner_common_lib',
@@ skipping 91 matching lines @@
       'shell_public',
       '<(DEPTH)/base/base.gyp:base',
       '<(DEPTH)/mojo/mojo_edk.gyp:mojo_run_all_unittests',
       '<(DEPTH)/testing/gtest.gyp:gtest',
     ],
     'sources': [
       'public/cpp/tests/interface_registry_unittest.cc',
     ],
   }],
 }