RefCounted types should not have public destructors, delegate cleanup

chrome/browser/bookmarks/base_bookmark_model_observer.h

 // Copyright (c) 2011 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 CHROME_BROWSER_BOOKMARKS_BASE_BOOKMARK_MODEL_OBSERVER_H_
 #define CHROME_BROWSER_BOOKMARKS_BASE_BOOKMARK_MODEL_OBSERVER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/bookmarks/bookmark_model_observer.h"
 
 // Base class for a BookmarkModelObserver implementation. All mutations of the
 // model funnel into the method BookmarkModelChanged.
 class BaseBookmarkModelObserver : public BookmarkModelObserver {
  public:
   BaseBookmarkModelObserver() {}
-  virtual ~BaseBookmarkModelObserver() {}
 
   virtual void BookmarkModelChanged() = 0;
 
   // BookmarkModelObserver:
   virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE;
   virtual void BookmarkModelBeingDeleted(BookmarkModel* model) OVERRIDE;
   virtual void BookmarkNodeMoved(BookmarkModel* model,
                                  const BookmarkNode* old_parent,
                                  int old_index,
                                  const BookmarkNode* new_parent,
                                  int new_index) OVERRIDE;
   virtual void BookmarkNodeAdded(BookmarkModel* model,
                                  const BookmarkNode* parent,
                                  int index) OVERRIDE;
   virtual void BookmarkNodeRemoved(BookmarkModel* model,
                                    const BookmarkNode* parent,
                                    int old_index,
                                    const BookmarkNode* node) OVERRIDE;
   virtual void BookmarkNodeChanged(BookmarkModel* model,
                                    const BookmarkNode* node) OVERRIDE;
   virtual void BookmarkNodeFaviconChanged(BookmarkModel* model,
                                           const BookmarkNode* node) OVERRIDE;
   virtual void BookmarkNodeChildrenReordered(BookmarkModel* model,
                                              const BookmarkNode* node) OVERRIDE;
 
+ protected:
+  virtual ~BaseBookmarkModelObserver() {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(BaseBookmarkModelObserver);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BASE_BOOKMARK_MODEL_OBSERVER_H_