downloads: Improve download rate estimation.

content/browser/download/base_file.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 CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 55 matching lines @@
   // Abort the download and automatically close the file.
   void Cancel();
 
   // Indicate that the download has finished. No new data will be received.
   void Finish();
 
   // Informs the OS that this file came from the internet. Returns a
   // DownloadInterruptReason indicating the result of the operation.
   DownloadInterruptReason AnnotateWithSourceInformation();
 
-  // Calculate and return the current speed in bytes per second.
-  int64 CurrentSpeed() const;
-
   base::FilePath full_path() const { return full_path_; }
   bool in_progress() const { return file_stream_.get() != NULL; }
   int64 bytes_so_far() const { return bytes_so_far_; }
 
   // Fills |hash| with the hash digest for the file.
   // Returns true if digest is successfully calculated.
   virtual bool GetHash(std::string* hash);
 
   // Returns the current (intermediate) state of the hash as a byte string.
   virtual std::string GetHashState();
@@ skipping 79 matching lines @@
   bool detached_;
 
   net::BoundNetLog bound_net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseFile);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_