Teach mojo_shell how to load http URLs

mojo/loader/url_request_context_getter.h

 // Copyright (c) 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_
 
 #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 {
 
 class URLRequestContextGetter : public net::URLRequestContextGetter {
  public:
-  URLRequestContextGetter();
+  URLRequestContextGetter(
+      base::SingleThreadTaskRunner* network_task_runner,
+      base::MessageLoopProxy* cache_task_runner);
   ~URLRequestContextGetter();
 
   virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE;
   virtual scoped_refptr<base::SingleThreadTaskRunner>
       GetNetworkTaskRunner() const OVERRIDE;
 
  private:
+  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 mojo
 
 #endif  // MOJO_URL_REQUEST_CONTEXT_GETTER_H_