bookmarks: Get rid of SetFileChanged() as it's called only once.

chrome/browser/bookmarks/bookmark_model.h

Index: chrome/browser/bookmarks/bookmark_model.h
diff --git a/chrome/browser/bookmarks/bookmark_model.h b/chrome/browser/bookmarks/bookmark_model.h
index e83f72ccab7f5f331b60d8c92669aa526f017ada..eb842863c40c46414a9b4bc055264ffbac73a9e5 100644
--- a/chrome/browser/bookmarks/bookmark_model.h
+++ b/chrome/browser/bookmarks/bookmark_model.h
@@ -430,9 +430,6 @@ class BookmarkModel : public content::NotificationObserver,
   // decoding since during decoding codec assigns node IDs.
   void set_next_node_id(int64 id) { next_node_id_ = id; }
 
-  // Records that the bookmarks file was changed externally.
-  void SetFileChanged();
-
   // Creates and returns a new BookmarkLoadDetails. It's up to the caller to
   // delete the returned object.
   BookmarkLoadDetails* CreateLoadDetails();