Remove more dead app list code.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index a47c1be56a70863342b6cba6e4f65afc1daa5ac8..95e2983353f13143e7da00240822b5cbb551a853 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2196,12 +2196,6 @@ const char kAppListEnableTime[] = "app_list.when_enabled";
 // Keeps local state of app list while sync service is not available.
 const char kAppListLocalState[] = "app_list.local_state";
 
-#if defined(OS_MACOSX)
-// Integer representing the version of the app launcher shortcut installed on
-// the system. Incremented, e.g., when embedded icons change.
-const char kAppLauncherShortcutVersion[] = "apps.app_launcher.shortcut_version";
-#endif
-
 // A boolean identifying if we should show the app launcher promo or not.
 const char kShowAppLauncherPromo[] = "app_launcher.show_promo";