Virtual destructors should have virtual keyword.

chrome/browser/ui/gtk/bookmarks/bookmark_bubble_gtk.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.
 
 // This is the GTK implementation of the bookmark bubble, the dialog box
 // presented to create or edit a bookmark.  There can only ever be a single
 // bubble open, so the class presents only static methods, and handles the
 // singleton behavior for you.  It also handles the object and widget
 // lifetimes, destroying everything and possibly committing any changes when
 // the bubble is closed.
@@ skipping 37 matching lines @@
   // NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details) OVERRIDE;
 
  private:
   BookmarkBubbleGtk(GtkWidget* anchor,
                     Profile* profile,
                     const GURL& url,
                     bool newly_bookmarked);
-  ~BookmarkBubbleGtk();
+  virtual ~BookmarkBubbleGtk();
 
   // Notified when |content_| is destroyed so we can delete our instance.
   CHROMEGTK_CALLBACK_0(BookmarkBubbleGtk, void, OnDestroy);
   CHROMEGTK_CALLBACK_0(BookmarkBubbleGtk, void, OnNameActivate);
   CHROMEGTK_CALLBACK_0(BookmarkBubbleGtk, void, OnFolderChanged);
   CHROMEGTK_CALLBACK_1(BookmarkBubbleGtk, void, OnFolderPopupShown,
                        GParamSpec*);
   CHROMEGTK_CALLBACK_0(BookmarkBubbleGtk, void, OnEditClicked);
   CHROMEGTK_CALLBACK_0(BookmarkBubbleGtk, void, OnCloseClicked);
   CHROMEGTK_CALLBACK_0(BookmarkBubbleGtk, void, OnRemoveClicked);
@@ skipping 49 matching lines @@
   // When closing the window, whether we should update or remove the bookmark.
   bool apply_edits_;
   bool remove_bookmark_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkBubbleGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BOOKMARKS_BOOKMARK_BUBBLE_GTK_H_