net: Implement canceling of all async operations in FileStream.

net/url_request/url_request_file_job.h

 // Copyright (c) 2012 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_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_FILE_JOB_H_
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
-#include "net/base/file_stream.h"
 #include "net/base/net_export.h"
 #include "net/http/http_byte_range.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_job.h"
 
+namespace base{
+struct PlatformFileInfo;
+}
 namespace file_util {
 struct FileInfo;
 }
 
 namespace net {
 
+class FileStream;
+
 // A request job that handles reading file URLs
 class NET_EXPORT URLRequestFileJob : public URLRequestJob {
  public:
   URLRequestFileJob(URLRequest* request,
                     NetworkDelegate* network_delegate,
                     const FilePath& file_path);
 
   static URLRequest::ProtocolFactory Factory;
 
   // URLRequestJob:
@@ skipping 15 matching lines @@
   // The OS-specific full path name of the file
   FilePath file_path_;
 
  private:
   // Callback after fetching file info on a background thread.
   void DidResolve(bool exists, const base::PlatformFileInfo& file_info);
 
   // Callback after data is asynchronously read from the file.
   void DidRead(int result);
 
-  FileStream stream_;
+  scoped_ptr<FileStream> stream_;
   bool is_directory_;
 
   HttpByteRange byte_range_;
   int64 remaining_bytes_;
 
   // The initial file metadata is fetched on a background thread.
   // AsyncResolver runs that task.
   class AsyncResolver;
   friend class AsyncResolver;
   scoped_refptr<AsyncResolver> async_resolver_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestFileJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_FILE_JOB_H_