Make DownloadHistory observe manager, items

chrome/browser/history/history_backend.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 CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 
 #include <string>
 #include <utility>
 
@@ skipping 267 matching lines @@
   // Downloads -----------------------------------------------------------------
 
   void GetNextDownloadId(scoped_refptr<DownloadNextIdRequest> request);
   void QueryDownloads(scoped_refptr<DownloadQueryRequest> request);
   void CleanUpInProgressEntries();
   void UpdateDownload(const content::DownloadPersistentStoreInfo& data);
   void UpdateDownloadPath(const FilePath& path, int64 db_handle);
   void CreateDownload(scoped_refptr<DownloadCreateRequest> request,
                       int32 id,
                       const content::DownloadPersistentStoreInfo& info);
-  void RemoveDownload(int64 db_handle);
-  void RemoveDownloadsBetween(const base::Time remove_begin,
-                              const base::Time remove_end);
-  void RemoveDownloads(const base::Time remove_end);
+  void RemoveDownloads(const std::set<int64>& handles);
 
   // Segment usage -------------------------------------------------------------
 
   void QuerySegmentUsage(scoped_refptr<QuerySegmentUsageRequest> request,
                          const base::Time from_time,
                          int max_result_count);
   void DeleteOldSegmentData();
   void SetSegmentPresentationIndex(SegmentID segment_id, int index);
 
   // Keyword search terms ------------------------------------------------------
@@ skipping 453 matching lines @@
   // Used to provide the Android ContentProvider APIs.
   scoped_ptr<AndroidProviderBackend> android_provider_backend_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_