Move mojo\shell to services\shell

mojo/shell/public/cpp/lib/shell_client.cc

-// Copyright 2014 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 "mojo/shell/public/cpp/shell_client.h"
-
-namespace mojo {
-
-ShellClient::ShellClient() {}
-ShellClient::~ShellClient() {}
-
-void ShellClient::Initialize(Connector* connector, const Identity& identity,
-                             uint32_t id) {
-}
-
-bool ShellClient::AcceptConnection(Connection* connection) {
-  return false;
-}
-
-bool ShellClient::ShellConnectionLost() { return true; }
-
-}  // namespace mojo