refactor: rename the atom directory to shell

shell/browser/ui/tray_icon_win.cc

@@ -0,0 +1,16 @@
+// Copyright (c) 2014 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/ui/win/notify_icon.h"
+#include "atom/browser/ui/win/notify_icon_host.h"
+
+namespace atom {
+
+// static
+TrayIcon* TrayIcon::Create() {
+  static NotifyIconHost host;
+  return host.CreateNotifyIcon();
+}
+
+}  // namespace atom