Enable find-missing-symbols-at-link-time for chromeos builds too.

components/user_manager.gypi

 # 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.
 
 {
   'variables': {
     # Cross-platform user_manager sources.
     'user_manager_shared_sources': [
       'user_manager/empty_user_info.cc',
       'user_manager/empty_user_info.h',
@@ skipping 33 matching lines @@
     'include_dirs': [
       '<(DEPTH)',
       '<(DEPTH)/ui/chromeos/ui_chromeos.gyp:ui_chromeos_resources',
       '<(DEPTH)/ui/chromeos/ui_chromeos.gyp:ui_chromeos_strings',
     ],
     'sources': [ '<@(user_manager_shared_sources)' ],
     'conditions': [
       ['chromeos == 1', {
         'dependencies': [
           '<(DEPTH)/base/base.gyp:base_prefs',
+          '<(DEPTH)/chromeos/chromeos.gyp:chromeos',
           '<(DEPTH)/components/components.gyp:session_manager_component',
           '<(DEPTH)/google_apis/google_apis.gyp:google_apis',
+          '<(DEPTH)/ui/base/ui_base.gyp:ui_base',
           '<(DEPTH)/ui/chromeos/ui_chromeos.gyp:ui_chromeos_resources',
           '<(DEPTH)/ui/chromeos/ui_chromeos.gyp:ui_chromeos_strings',
           '<(DEPTH)/url/url.gyp:url_lib',
         ],
         'sources': [ '<@(user_manager_chromeos_sources)' ],
       }],
     ],
   }],
 }