Database usage adjustment for .../history

chrome/browser/history/download_database.h

 // Copyright (c) 2011 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 CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 40 matching lines @@
   // Create a new database entry for one download and return its primary db id.
   int64 CreateDownload(const DownloadPersistentStoreInfo& info);
 
   // Remove a download from the database.
   void RemoveDownload(DownloadID db_handle);
 
   // Remove all completed downloads that started after |remove_begin|
   // (inclusive) and before |remove_end|. You may use null Time values
   // to do an unbounded delete in either direction. This function ignores
   // all downloads that are in progress or are waiting to be cancelled.
-  void RemoveDownloadsBetween(base::Time remove_begin, base::Time remove_end);
+  bool RemoveDownloadsBetween(base::Time remove_begin, base::Time remove_end);
 
  protected:
   // Returns the database for the functions in this interface.
   virtual sql::Connection& GetDB() = 0;
 
   // Creates the downloads table if needed.
   bool InitDownloadTable();
 
   // Used to quickly clear the downloads. First you would drop it, then you
   // would re-initialize it.
@@ skipping 12 matching lines @@
 
   int next_id_;
   sql::MetaTable meta_table_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadDatabase);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_