Move shell service to toplevel shell namespace

services/shell/loader.h

 // 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.
 
 #ifndef SERVICES_SHELL_LOADER_H_
 #define SERVICES_SHELL_LOADER_H_
 
 #include "base/callback.h"
 #include "mojo/public/cpp/system/core.h"
 #include "services/shell/public/interfaces/connector.mojom.h"
 #include "services/shell/public/interfaces/shell_client.mojom.h"
 
-namespace mojo {
 namespace shell {
 
 // Interface to implement special loading behavior for a particular name.
 class Loader {
  public:
   virtual ~Loader() {}
 
   virtual void Load(const std::string& name,
                     mojom::ShellClientRequest request) = 0;
 };
 
 }  // namespace shell
-}  // namespace mojo
 
 #endif  // SERVICES_SHELL_LOADER_H_