Add more GN deps to the build.

components/policy.gypi

 # Copyright 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.
 
 {
   'includes': [
     # Included to get 'mac_bundle_id' and other variables.
     '../build/chrome_settings.gypi',
   ],
   'variables': {
@@ skipping 180 matching lines @@
             'cloud_policy_code_generate',
             'cloud_policy_proto_generated_compile',
             '<(DEPTH)/base/base.gyp:base',
             '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite',
           ],
           'defines': [
             'POLICY_COMPONENT_IMPLEMENTATION',
           ],
         },
         {
+          # GN version: //components/policy/proto
           'target_name': 'cloud_policy_proto',
           'type': '<(component)',
           'sources': [
             'policy/proto/chrome_extension_policy.proto',
             'policy/proto/device_management_backend.proto',
             'policy/proto/device_management_local.proto',
             'policy/proto/policy_signing_key.proto',
           ],
           'variables': {
             'proto_in_dir': 'policy/proto',
@@ skipping 220 matching lines @@
               'message':
                   'Copy the Localizable.strings files to the manifest bundle',
               'process_outputs_as_mac_bundle_resources': 1,
             },
           ],
         },
       ],
     }],
   ],
 }