RefCounted types should not have public destructors, delegate cleanup

chrome/browser/bookmarks/base_bookmark_model_observer.h

Index: chrome/browser/bookmarks/base_bookmark_model_observer.h
diff --git a/chrome/browser/bookmarks/base_bookmark_model_observer.h b/chrome/browser/bookmarks/base_bookmark_model_observer.h
index 6c01483afdeaba8fbe0780e879d27bdd395efc34..f40ddea605f77b404a43314eee769f68c016b2b0 100644
--- a/chrome/browser/bookmarks/base_bookmark_model_observer.h
+++ b/chrome/browser/bookmarks/base_bookmark_model_observer.h
@@ -15,7 +15,6 @@
 class BaseBookmarkModelObserver : public BookmarkModelObserver {
  public:
   BaseBookmarkModelObserver() {}
-  virtual ~BaseBookmarkModelObserver() {}
 
   virtual void BookmarkModelChanged() = 0;
 
@@ -41,6 +40,9 @@ class BaseBookmarkModelObserver : public BookmarkModelObserver {
   virtual void BookmarkNodeChildrenReordered(BookmarkModel* model,
                                              const BookmarkNode* node) OVERRIDE;
 
+ protected:
+  virtual ~BaseBookmarkModelObserver() {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(BaseBookmarkModelObserver);
 };