Remove --show-app-list-shortcut flag and implement new app launcher enable logic.

apps/switches.h

Index: apps/switches.h
diff --git a/apps/switches.h b/apps/switches.h
deleted file mode 100644
index 6f7671fd80106b97eac617e153fe7bcaf55edcfb..0000000000000000000000000000000000000000
--- a/apps/switches.h
+++ /dev/null
@@ -1,18 +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_SWITCHES_H_
-#define APPS_SWITCHES_H_
-
-namespace apps {
-namespace switches {
-
-// Alphabetical list of switches specific to Apps component.
-// Keep alphabetized and document each one in the source file.
-extern const char kShowAppListShortcut[];
-
-}  // namespace switches
-}  // namespace apps
-
-#endif  // APPS_SWITCHES_H_