Make DownloadHistory observe manager, items

content/shell/shell_download_manager_delegate.cc

Index: content/shell/shell_download_manager_delegate.cc
diff --git a/content/shell/shell_download_manager_delegate.cc b/content/shell/shell_download_manager_delegate.cc
index 8290ea2d2f6f9f3152056fcebc71f046058f8bd4..bbc299db44b22b50d1f5ab70da75c3c60745d1d5 100644
--- a/content/shell/shell_download_manager_delegate.cc
+++ b/content/shell/shell_download_manager_delegate.cc
@@ -29,8 +29,7 @@ namespace content {
 
 ShellDownloadManagerDelegate::ShellDownloadManagerDelegate()
     : download_manager_(NULL),
-      suppress_prompting_(false),
-      last_download_db_handle_(DownloadItem::kUninitializedHandle) {
+      suppress_prompting_(false) {
   // Balanced in Shutdown();
   AddRef();
 }
@@ -182,12 +181,6 @@ void ShellDownloadManagerDelegate::ChooseDownloadPath(
                DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS, result);
 }
 
-void ShellDownloadManagerDelegate::AddItemToPersistentStore(
-    DownloadItem* item) {
-  download_manager_->OnItemAddedToPersistentStore(
-      item->GetId(), --last_download_db_handle_);
-}
-
 void ShellDownloadManagerDelegate::SetDownloadBehaviorForTesting(
     const FilePath& default_download_path) {
   default_download_path_ = default_download_path;