Use FilterContext to allow filters to access URLRequestJob data...

net/url_request/url_request_file_dir_job.h

 // Copyright (c) 2006-2008 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 NET_URL_REQUEST_URL_REQUEST_FILE_DIR_JOB_H__
 #define NET_URL_REQUEST_URL_REQUEST_FILE_DIR_JOB_H__
 
+#include <string>
+
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "net/base/directory_lister.h"
 #include "net/url_request/url_request_job.h"
 
 class URLRequestFileDirJob
   : public URLRequestJob,
     public net::DirectoryLister::DirectoryListerDelegate {
  public:
   URLRequestFileDirJob(URLRequest* request, const FilePath& dir_path);
   virtual ~URLRequestFileDirJob();
 
   // URLRequestJob methods:
   virtual void Start();
   virtual void StartAsync();
   virtual void Kill();
   virtual bool ReadRawData(net::IOBuffer* buf, int buf_size, int *bytes_read);
-  virtual bool GetMimeType(std::string* mime_type);
+  virtual bool GetMimeType(std::string* mime_type) const;
   virtual bool GetCharset(std::string* charset);
   virtual bool IsRedirectResponse(GURL* location, int* http_status_code);
 
   // DirectoryLister::DirectoryListerDelegate methods:
   virtual void OnListFile(const file_util::FileEnumerator::FindInfo& data);
   virtual void OnListDone(int error);
 
  private:
   void CloseLister();
   // When we have data and a read has been pending, this function
@@ skipping 20 matching lines @@
   // manually.
   bool read_pending_;
   scoped_refptr<net::IOBuffer> read_buffer_;
   int read_buffer_length_;
 
   DISALLOW_EVIL_CONSTRUCTORS(URLRequestFileDirJob);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_FILE_DIR_JOB_H__