Revert of Remove installation of Chrome Frame.

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 kAltShortcutText[] = "alternate_shortcut_text";
   const char kAutoLaunchChrome[] = "auto_launch_chrome";
   const char kChrome[] = "chrome";
   // TODO(huangs): Remove by M27.
   const char kChromeAppHostDeprecated[] = "app_host";
   const char kChromeAppLauncher[] = "app_launcher";
+  const char kChromeFrame[] = "chrome_frame";
   const char kChromeShortcutIconIndex[] = "chrome_shortcut_icon_index";
   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";
@@ skipping 15 matching lines @@
   const char kSuppressFirstRunDefaultBrowserPrompt[] =
       "suppress_first_run_default_browser_prompt";
   const char kMsi[] = "msi";
   const char kMultiInstall[] = "multi_install";
   const char kRequireEula[] = "require_eula";
   const char kSystemLevel[] = "system_level";
   const char kVerboseLogging[] = "verbose_logging";
   const char kExtensionsBlock[] = "extensions.settings";
 }  // namespace master_preferences
 }  // namespace installer