Make DownloadHistory observe manager, items

content/browser/download/download_stats.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.
 //
 // Holds helpers for gathering UMA stats about downloads.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 
 #include <string>
@@ skipping 110 matching lines @@
 void RecordFileThreadReceiveBuffers(size_t num_buffers);
 
 // Record the bandwidth seen in DownloadResourceHandler
 // |actual_bandwidth| and |potential_bandwidth| are in bytes/second.
 void RecordBandwidth(double actual_bandwidth, double potential_bandwidth);
 
 // Record the time of both the first open and all subsequent opens since the
 // download completed.
 void RecordOpen(const base::Time& end, bool first);
 
-// Record the number of items that are in the history at the time that a
-// new download is added to the history.
-void RecordHistorySize(int size);
-
 // Record whether or not the server accepts ranges, and the download size.
 void RecordAcceptsRanges(const std::string& accepts_ranges, int64 download_len);
 
 // Record the number of downloads removed by ClearAll.
 void RecordClearAllSize(int size);
 
 // Record the number of completed unopened downloads when a download is opened.
 void RecordOpensOutstanding(int size);
 
 // Record how long we block the file thread at a time.
@@ skipping 27 matching lines @@
   SAVE_PACKAGE_WRITE_TO_FAILED,
 
   SAVE_PACKAGE_LAST_ENTRY
 };
 
 void RecordSavePackageEvent(SavePackageEvent event);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_