Remove the app launcher promo 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 d77ee9ebf2ff9675ea1624102dde116a413cc451..61d16b5d1069b4f5badbc899cbb2557b483aba92 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2059,9 +2059,6 @@ const char kAppListLastLaunchTime[] = "app_list.last_launch";
 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";
-
 // A dictionary that tracks the Drive app to Chrome app mapping. The key is
 // a Drive app id and the value is the corresponding Chrome app id. The pref
 // is unsynable and used to track local mappings only.