Remove the dependence on BrowserThread::FILE for

content/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 CONTENT_SHELL_BROWSER_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
 #define CONTENT_SHELL_BROWSER_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 16 matching lines @@
 }
 
 namespace content {
 
 class ShellURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   ShellURLRequestContextGetter(
       bool ignore_certificate_errors,
       const base::FilePath& base_path,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
+      // TODO(eroman): Remove the file_task_runner parameter (unused).
       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
       ProtocolHandlerMap* protocol_handlers,
       URLRequestInterceptorScopedVector request_interceptors,
       net::NetLog* net_log);
 
   // net::URLRequestContextGetter implementation.
   net::URLRequestContext* GetURLRequestContext() override;
   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
       const override;
 
@@ skipping 21 matching lines @@
   std::unique_ptr<net::URLRequestContext> url_request_context_;
   ProtocolHandlerMap protocol_handlers_;
   URLRequestInterceptorScopedVector request_interceptors_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellURLRequestContextGetter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_SHELL_URL_REQUEST_CONTEXT_GETTER_H_