Allow normal users to change per session flags.

chrome/browser/prefs/browser_prefs.cc

 // 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.
 
 #include "chrome/browser/prefs/browser_prefs.h"
 
 #include "apps/prefs.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/about_flags.h"
@@ skipping 263 matching lines @@
   ChromeDownloadManagerDelegate::RegisterUserPrefs(registry);
   ChromeVersionService::RegisterUserPrefs(registry);
   chrome_browser_net::HttpServerPropertiesManager::RegisterUserPrefs(
       registry);
   chrome_browser_net::Predictor::RegisterUserPrefs(registry);
   DownloadPrefs::RegisterUserPrefs(registry);
   extensions::ComponentLoader::RegisterUserPrefs(registry);
   extensions::ExtensionPrefs::RegisterUserPrefs(registry);
   ExtensionWebUI::RegisterUserPrefs(registry);
   first_run::RegisterUserPrefs(registry);
+  FlagsUI::RegisterUserPrefs(registry);
   HostContentSettingsMap::RegisterUserPrefs(registry);
   IncognitoModePrefs::RegisterUserPrefs(registry);
   InstantUI::RegisterUserPrefs(registry);
   browser_sync::InvalidatorStorage::RegisterUserPrefs(registry);
   MediaCaptureDevicesDispatcher::RegisterUserPrefs(registry);
   MediaStreamDevicesController::RegisterUserPrefs(registry);
   NetPrefObserver::RegisterUserPrefs(registry);
   NewTabUI::RegisterUserPrefs(registry);
   PasswordManager::RegisterUserPrefs(registry);
   PrefProxyConfigTrackerImpl::RegisterUserPrefs(registry);
@@ skipping 143 matching lines @@
     }
     local_state->ClearPref(prefs::kLastPromptedGoogleURL);
 
     current_version |= GOOGLE_URL_TRACKER_PREFS;
     local_state->SetInteger(prefs::kMultipleProfilePrefMigration,
                             current_version);
   }
 }
 
 }  // namespace chrome