Add chrome/browser/ui to the GN build.

ui/strings/ui_strings.gyp

 # 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': {
     'chromium_code': 1,
     'grit_base_out_dir': '<(SHARED_INTERMEDIATE_DIR)/ui',
   },
   'targets': [
     {
       'target_name': 'ui_strings',
       'type': 'none',
       'actions': [
         {
           'action_name': 'ui_strings',
           'variables': {
             'grit_grd_file': 'ui_strings.grd',
-            'grit_out_dir': '<(grit_base_out_dir)/ui_strings',
+            'grit_out_dir': '<(grit_base_out_dir)/strings',
           },
           'includes': [ '../../build/grit_action.gypi' ],
         },
         {
           'action_name': 'app_locale_settings',
           'variables': {
             'grit_grd_file': 'app_locale_settings.grd',
             'grit_out_dir': '<(grit_base_out_dir)/app_locale_settings',
           },
           'includes': [ '../../build/grit_action.gypi' ],
         },
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(grit_base_out_dir)/app_locale_settings',
-          '<(grit_base_out_dir)/ui_strings',
+          '<(grit_base_out_dir)/strings',
         ],
       },
     },
   ],
 }