Make it possible to build without enable_supervised_users.

chrome/browser/browser_process_impl.h

 // Copyright (c) 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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 298 matching lines @@
   // to concerns over integrity of data shared between profiles,
   // but some users of component updater only install per-user.
   std::unique_ptr<component_updater::ComponentUpdateService> component_updater_;
   scoped_refptr<CRLSetFetcher> crl_set_fetcher_;
 
 #if !defined(DISABLE_NACL)
   scoped_refptr<component_updater::PnaclComponentInstaller>
       pnacl_component_installer_;
 #endif
 
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
   std::unique_ptr<component_updater::SupervisedUserWhitelistInstaller>
       supervised_user_whitelist_installer_;
+#endif
 
 #if BUILDFLAG(ENABLE_PLUGINS)
   std::unique_ptr<PluginsResourceService> plugins_resource_service_;
 #endif
 
   std::unique_ptr<BrowserProcessPlatformPart> platform_part_;
 
   // TODO(eroman): Remove this when done debugging 113031. This tracks
   // the callstack which released the final module reference count.
   base::debug::StackTrace release_last_reference_callstack_;
@@ skipping 21 matching lines @@
 
   std::unique_ptr<physical_web::PhysicalWebDataSource>
       physical_web_data_source_;
 
   SEQUENCE_CHECKER(sequence_checker_);
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_