Use the mojo::shell namespace consistently underly shell/.

shell/android/background_application_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 SHELL_ANDROID_BACKGROUND_APPLICATION_LOADER_H_
 #define SHELL_ANDROID_BACKGROUND_APPLICATION_LOADER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/simple_thread.h"
 #include "shell/application_manager/application_loader.h"
 
 namespace mojo {
+namespace shell {
 
 class BackgroundApplicationLoader
     : public ApplicationLoader,
       public base::DelegateSimpleThread::Delegate {
  public:
   BackgroundApplicationLoader(scoped_ptr<ApplicationLoader> real_loader,
                               const std::string& thread_name,
                               base::MessageLoop::Type message_loop_type);
   ~BackgroundApplicationLoader() override;
 
@@ skipping 24 matching lines @@
   base::WaitableEvent message_loop_created_;
 
   // Lives on |thread_|.
   base::Closure quit_closure_;
 
   scoped_ptr<base::DelegateSimpleThread> thread_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundApplicationLoader);
 };
 
+}  // namespace shell
 }  // namespace mojo
 
 #endif  // SHELL_ANDROID_BACKGROUND_APPLICATION_LOADER_H_