Fix build when ENABLE_MANAGED_USERS is not defined

chrome/chrome_browser_ui.gypi

 # Copyright 2012 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': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 2897 matching lines @@
               'dependencies': [
                 '../third_party/libaddressinput/libaddressinput.gyp:libaddressinput',
                 '../third_party/libaddressinput/libaddressinput.gyp:libaddressinput_strings',
               ],
             }],
           ],
         }],
         ['enable_google_now==1 and OS!="android"', {
           'sources': [ '<@(chrome_browser_ui_google_now_non_android_sources)' ],
         }],
+        ['enable_managed_users==0', {
+          'sources!': [
+            'browser/ui/webui/options/managed_user_create_confirm_handler.cc',
+            'browser/ui/webui/options/managed_user_create_confirm_handler.h',
+            'browser/ui/webui/options/managed_user_import_handler.cc',
+            'browser/ui/webui/options/managed_user_import_handler.h',
+            'browser/ui/webui/options/managed_user_learn_more_handler.cc',
+            'browser/ui/webui/options/managed_user_learn_more_handler.h',
+          ],
+        }],
         ['enable_webrtc==1', {
           'sources': [ '<@(chrome_browser_ui_webrtc_sources)' ],
         }],
         ['enable_service_discovery==1', {
           'sources': [ '<@(chrome_browser_ui_service_discovery_sources)' ],
         }],
       ],
     },
   ],
 }