Remove kDistroDict from Preferences.

chrome/installer/util/master_preferences_constants.cc

 // 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.
 
 #include "chrome/installer/util/master_preferences_constants.h"
 
 namespace installer {
 namespace master_preferences {
-  const char kCreateAllShortcuts[] = "create_all_shortcuts";
   const char kDisableLogging[] = "disable_logging";
   const char kDistroDict[] = "distribution";
   const char kDistroImportBookmarksPref[] = "import_bookmarks";
   const char kDistroImportBookmarksFromFilePref[] =
       "import_bookmarks_from_file";
   const char kDistroImportHistoryPref[] = "import_history";
   const char kDistroImportHomePagePref[] = "import_home_page";
   const char kDistroImportSearchPref[] = "import_search_engine";
-  const char kDistroPingDelay[] = "ping_delay";
   const char kDistroSuppressDefaultBrowserPromptPref[] =
       "suppress_default_browser_prompt_for_version";
   const char kDistroSuppressFirstRunBubble[] = "suppress_first_run_bubble";
   const char kDistroWelcomePageOnOSUpgradeEnabled[] =
       "welcome_page_on_os_upgrade_enabled";
   const char kDoNotCreateAnyShortcuts[] = "do_not_create_any_shortcuts";
   const char kDoNotCreateDesktopShortcut[] = "do_not_create_desktop_shortcut";
   const char kDoNotCreateQuickLaunchShortcut[] =
       "do_not_create_quick_launch_shortcut";
   const char kDoNotCreateTaskbarShortcut[] = "do_not_create_taskbar_shortcut";
   const char kDoNotLaunchChrome[] = "do_not_launch_chrome";
   const char kDoNotRegisterForUpdateLaunch[] =
       "do_not_register_for_update_launch";
   const char kLogFile[] = "log_file";
   const char kMakeChromeDefault[] = "make_chrome_default";
   const char kMakeChromeDefaultForUser[] = "make_chrome_default_for_user";
   const char kSuppressFirstRunDefaultBrowserPrompt[] =
       "suppress_first_run_default_browser_prompt";
   const char kMsi[] = "msi";
   const char kMsiProductId[] = "msi_product_id";
   const char kRequireEula[] = "require_eula";
   const char kSystemLevel[] = "system_level";
   const char kVerboseLogging[] = "verbose_logging";
   const char kExtensionsBlock[] = "extensions.settings";
   const char kAllowDowngrade[] = "allow_downgrade";
 
 }  // namespace master_preferences
 }  // namespace installer