Supporting undoing bookmark deletion without creating new ID.

components/undo/bookmark_renumber_observer.h

Index: components/undo/bookmark_renumber_observer.h
diff --git a/components/undo/bookmark_renumber_observer.h b/components/undo/bookmark_renumber_observer.h
deleted file mode 100644
index 4dc8df058eb44ff6a482fd69fe2dd63ea45b0b72..0000000000000000000000000000000000000000
--- a/components/undo/bookmark_renumber_observer.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2013 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 COMPONENTS_UNDO_BOOKMARK_RENUMBER_OBSERVER_H_
-#define COMPONENTS_UNDO_BOOKMARK_RENUMBER_OBSERVER_H_
-
-#include "base/basictypes.h"
-
-class BookmarkRenumberObserver {
- public:
-  // Invoked when a bookmark id has been renumbered so that any
-  // BookmarkUndoOperations that refer to that bookmark can be updated.
-  virtual void OnBookmarkRenumbered(int64 old_id, int64 new_id) = 0;
-
- protected:
-  virtual ~BookmarkRenumberObserver() {}
-};
-
-#endif  // COMPONENTS_UNDO_BOOKMARK_RENUMBER_OBSERVER_H_