mash: Cleanup ash shelf application menu code.

ash/public/cpp/shelf_application_menu_item.cc

Index: ash/public/cpp/shelf_application_menu_item.cc
diff --git a/ash/public/cpp/shelf_application_menu_item.cc b/ash/public/cpp/shelf_application_menu_item.cc
new file mode 100644
index 0000000000000000000000000000000000000000..77550c994e77d5bcbfe36c57704da8614ffff159
--- /dev/null
+++ b/ash/public/cpp/shelf_application_menu_item.cc
@@ -0,0 +1,17 @@
+// Copyright 2017 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 "ash/public/cpp/shelf_application_menu_item.h"
+
+namespace ash {
+
+ShelfApplicationMenuItem::ShelfApplicationMenuItem(const base::string16 title,
+                                                   const gfx::Image* icon)
+    : title_(title), icon_(icon ? gfx::Image(*icon) : gfx::Image()) {}
+
+ShelfApplicationMenuItem::~ShelfApplicationMenuItem() {}
+
+void ShelfApplicationMenuItem::Execute(int event_flags) {}
+
+}  // namespace ash