Remove some usages of BrowserThread::UnsafeGetMessageLoopForThread

extensions/shell/browser/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 EXTENSIONS_SHELL_BROWSER_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "content/shell/browser/shell_url_request_context_getter.h"
@@ skipping 15 matching lines @@
 
 class InfoMap;
 
 class ShellURLRequestContextGetter :
   public content::ShellURLRequestContextGetter {
  public:
   ShellURLRequestContextGetter(
       content::BrowserContext* browser_context,
       bool ignore_certificate_errors,
       const base::FilePath& base_path,
-      base::MessageLoop* io_loop,
-      base::MessageLoop* file_loop,
+      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
       content::ProtocolHandlerMap* protocol_handlers,
       content::URLRequestInterceptorScopedVector request_interceptors,
       net::NetLog* net_log,
       InfoMap* extension_info_map);
 
   // content::ShellURLRequestContextGetter implementation.
   scoped_ptr<net::NetworkDelegate> CreateNetworkDelegate() override;
 
 protected:
  ~ShellURLRequestContextGetter() override;
 
 private:
   content::BrowserContext* browser_context_;
   InfoMap* extension_info_map_;
 
 private:
   DISALLOW_COPY_AND_ASSIGN(ShellURLRequestContextGetter);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_URL_REQUEST_CONTEXT_GETTER_H_