net: Use SequencedTaskRunner for URLFetcherResponseWriter

net/url_request/url_fetcher_response_writer.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 NET_URL_REQUEST_URL_FETCHER_RESPONSE_WRITER_H_
 #define NET_URL_REQUEST_URL_FETCHER_RESPONSE_WRITER_H_
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 
 namespace base {
-class TaskRunner;
+class SequencedTaskRunner;
 }  // namespace base
 
 namespace net {
 
 class DrainableIOBuffer;
 class FileStream;
 class IOBuffer;
 class URLFetcherFileWriter;
 class URLFetcherStringWriter;
 
@@ skipping 46 matching lines @@
   std::string data_;
 
   DISALLOW_COPY_AND_ASSIGN(URLFetcherStringWriter);
 };
 
 // URLFetcherResponseWriter implementation for files.
 class NET_EXPORT URLFetcherFileWriter : public URLFetcherResponseWriter {
  public:
   // |file_path| is used as the destination path. If |file_path| is empty,
   // Initialize() will create a temporary file.
-  URLFetcherFileWriter(scoped_refptr<base::TaskRunner> file_task_runner,
-                       const base::FilePath& file_path);
+  URLFetcherFileWriter(
+      scoped_refptr<base::SequencedTaskRunner> file_task_runner,
+      const base::FilePath& file_path);
   virtual ~URLFetcherFileWriter();
 
   const base::FilePath& file_path() const { return file_path_; }
 
   // URLFetcherResponseWriter overrides:
   virtual int Initialize(const CompletionCallback& callback) OVERRIDE;
   virtual int Write(IOBuffer* buffer,
                     int num_bytes,
                     const CompletionCallback& callback) OVERRIDE;
   virtual int Finish(const CompletionCallback& callback) OVERRIDE;
@@ skipping 19 matching lines @@
   void DidOpenFile(const CompletionCallback& callback,
                    int result);
 
   // Callback which gets the result of closing a file.
   void CloseComplete(const CompletionCallback& callback, int result);
 
   // Callbacks are created for use with base::FileUtilProxy.
   base::WeakPtrFactory<URLFetcherFileWriter> weak_factory_;
 
   // Task runner on which file operations should happen.
-  scoped_refptr<base::TaskRunner> file_task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
 
   // Destination file path.
   // Initialize() creates a temporary file if this variable is empty.
   base::FilePath file_path_;
 
   // True when this instance is responsible to delete the file at |file_path_|.
   bool owns_file_;
 
   scoped_ptr<FileStream> file_stream_;
 
   DISALLOW_COPY_AND_ASSIGN(URLFetcherFileWriter);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_FETCHER_RESPONSE_WRITER_H_