Remove the app launcher promo code

apps/metrics_names.h

Index: apps/metrics_names.h
diff --git a/apps/metrics_names.h b/apps/metrics_names.h
deleted file mode 100644
index 138489dd30ce8e05f5515e1313ab7a7792a8ef2e..0000000000000000000000000000000000000000
--- a/apps/metrics_names.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2013 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.
-
-#ifndef APPS_METRICS_NAMES_H_
-#define APPS_METRICS_NAMES_H_
-
-namespace apps {
-
-// Histogram metrics individual values.
-enum AppLauncherPromoHistogramValues {
-  APP_LAUNCHER_PROMO_ALREADY_INSTALLED,
-  APP_LAUNCHER_PROMO_SHOWN,
-  APP_LAUNCHER_PROMO_DISMISSED,
-  APP_LAUNCHER_PROMO_LEARN_MORE,
-  APP_LAUNCHER_PROMO_MAX
-};
-
-}  // namespace apps
-
-#endif  // APPS_METRICS_NAMES_H_