[Downloads] Deprecate incorrect metrics.

content/browser/download/download_request_core.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_DOWNLOAD_REQUEST_CORE_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_CORE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 128 matching lines @@
   scoped_refptr<net::IOBuffer> read_buffer_;    // From URLRequest.
   std::unique_ptr<ByteStreamWriter> stream_writer_;  // To rest of system.
 
   // Keeps the system from sleeping while this is alive. If the
   // system enters power saving mode while a request is alive, it can cause the
   // request to fail and the associated download will be interrupted.
   std::unique_ptr<device::PowerSaveBlocker> power_save_blocker_;
 
   // The following are used to collect stats.
   base::TimeTicks download_start_time_;
-  base::TimeTicks last_read_time_;
   base::TimeTicks last_stream_pause_time_;
   base::TimeDelta total_pause_time_;
-  size_t last_buffer_size_;
+
   int64_t bytes_read_;
 
   int pause_count_;
   bool was_deferred_;
   bool is_partial_request_;
   bool started_;
 
   // When DownloadRequestCore initiates an abort (by blocking a redirect, for
   // example) it expects to eventually receive a OnResponseCompleted() with a
   // status indicating that the request was aborted. When this happens, the
   // interrupt reason in |abort_reason_| will be used instead of USER_CANCELED
   // which is vague.
   DownloadInterruptReason abort_reason_;
 
   // Each successful OnWillRead will yield a buffer of this size.
   static const int kReadBufSize = 32768;   // bytes
 
   DISALLOW_COPY_AND_ASSIGN(DownloadRequestCore);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_CORE_H_