Eliminate Bookmarks dependence to bookmark_undo_utils.h.

chrome/browser/undo/bookmark_undo_service.h

Index: chrome/browser/undo/bookmark_undo_service.h
diff --git a/chrome/browser/undo/bookmark_undo_service.h b/chrome/browser/undo/bookmark_undo_service.h
index 2404ecef9140eeb7537c4bd35fece50eeebcfcb9..6ea0ed42f081e8326275c04b5e41e7a5ffab9f90 100644
--- a/chrome/browser/undo/bookmark_undo_service.h
+++ b/chrome/browser/undo/bookmark_undo_service.h
@@ -54,6 +54,8 @@ class BookmarkUndoService : public BaseBookmarkModelObserver,
                                         const BookmarkNode* node) OVERRIDE;
   virtual void OnWillReorderBookmarkNode(BookmarkModel* model,
                                          const BookmarkNode* node) OVERRIDE;
+  virtual void GroupedBookmarkChangesBeginning(BookmarkModel* model) OVERRIDE;
+  virtual void GroupedBookmarkChangesEnded(BookmarkModel* model) OVERRIDE;
 
   // BookmarkRenumberObserver:
   virtual void OnBookmarkRenumbered(int64 old_id, int64 new_id) OVERRIDE;