Make DownloadHistory observe manager, items

chrome/browser/history/history_backend.h

Index: chrome/browser/history/history_backend.h
diff --git a/chrome/browser/history/history_backend.h b/chrome/browser/history/history_backend.h
index a3f831db4abffa0f62faba9805ae8aa858e0096c..e52b53b228e5c917c59a8761e79b24303c445ae0 100644
--- a/chrome/browser/history/history_backend.h
+++ b/chrome/browser/history/history_backend.h
@@ -27,11 +27,8 @@
 
 class BookmarkService;
 class TestingProfile;
-struct ThumbnailScore;
-
-namespace content {
 struct DownloadPersistentStoreInfo;
-}
+struct ThumbnailScore;
 
 namespace history {
 #if defined(OS_ANDROID)
@@ -308,15 +305,10 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   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 UpdateDownload(const DownloadPersistentStoreInfo& data);
   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);
+                      const DownloadPersistentStoreInfo& info);
+  void RemoveDownloads(const std::set<int64>& db_handles);
 
   // Segment usage -------------------------------------------------------------