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

shell/android/android_handler.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 MOJO_SHELL_ANDROID_CONTENT_HANDLER_H_
 #define MOJO_SHELL_ANDROID_CONTENT_HANDLER_H_
 
 #include <jni.h>
 
 #include "mojo/application/content_handler_factory.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory_impl.h"
 #include "mojo/services/content_handler/public/interfaces/content_handler.mojom.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace mojo {
+namespace shell {
 
 class AndroidHandler : public ApplicationDelegate,
                        public ContentHandlerFactory::Delegate {
  public:
   AndroidHandler();
   ~AndroidHandler();
 
  private:
   // ApplicationDelegate:
   void Initialize(ApplicationImpl* app) override;
   bool ConfigureIncomingConnection(ApplicationConnection* connection) override;
 
   // ContentHandlerFactory::Delegate:
   void RunApplication(InterfaceRequest<Application> application_request,
                       URLResponsePtr response) override;
 
   ContentHandlerFactory content_handler_factory_;
   MOJO_DISALLOW_COPY_AND_ASSIGN(AndroidHandler);
 };
 
 bool RegisterAndroidHandlerJni(JNIEnv* env);
 
+}  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_ANDROID_CONTENT_HANDLER_H_