Cleanup mojo_shell and sample_app a bit

mojo/shell/url_request_context_getter.h

 // Copyright 2013 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_URL_REQUEST_CONTEXT_GETTER_H_
-#define MOJO_URL_REQUEST_CONTEXT_GETTER_H_
+#ifndef MOJO_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
+#define MOJO_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_context_storage.h"
 
 namespace mojo {
-namespace loader {
+namespace shell {
 
 class URLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   URLRequestContextGetter(
       base::FilePath base_path,
       base::SingleThreadTaskRunner* network_task_runner,
       base::MessageLoopProxy* cache_task_runner);
 
   virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE;
   virtual scoped_refptr<base::SingleThreadTaskRunner>
       GetNetworkTaskRunner() const OVERRIDE;
 
  protected:
   virtual ~URLRequestContextGetter();
 
  private:
   base::FilePath base_path_;
   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
   scoped_refptr<base::MessageLoopProxy> cache_task_runner_;
   scoped_ptr<net::NetLog> net_log_;
   scoped_ptr<net::URLRequestContextStorage> storage_;
   scoped_ptr<net::URLRequestContext> url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextGetter);
 };
 
-}  // namespace loader
+}  // namespace shell
 }  // namespace mojo
 
-#endif  // MOJO_URL_REQUEST_CONTEXT_GETTER_H_
+#endif  // MOJO_SHELL_URL_REQUEST_CONTEXT_GETTER_H_