Virtual destructors should have virtual keyword.

chrome/browser/ui/gtk/tab_contents_container_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.
 
 #ifndef CHROME_BROWSER_UI_GTK_TAB_CONTENTS_CONTAINER_GTK_H_
 #define CHROME_BROWSER_UI_GTK_TAB_CONTENTS_CONTAINER_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
 #include "base/basictypes.h"
 #include "chrome/browser/ui/gtk/owned_widget_gtk.h"
 #include "chrome/browser/ui/gtk/view_id_util.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 #include "ui/base/gtk/gtk_signal.h"
 
 class RenderViewHost;
 class StatusBubbleGtk;
 class TabContents;
 class TabContentsWrapper;
 
 typedef struct _GtkFloatingContainer GtkFloatingContainer;
 
 class TabContentsContainerGtk : public NotificationObserver,
                                 public ViewIDUtil::Delegate {
  public:
   explicit TabContentsContainerGtk(StatusBubbleGtk* status_bubble);
-  ~TabContentsContainerGtk();
+  virtual ~TabContentsContainerGtk();
 
   void Init();
 
   // Make the specified tab visible.
   void SetTab(TabContentsWrapper* tab);
   TabContentsWrapper* tab() const { return tab_; }
 
   // Gets the tab contents currently being displayed (either |tab_contents_| or
   // |preview_contents_|).
   TabContents* GetVisibleTabContents();
@@ skipping 62 matching lines @@
   // We insert and remove TabContents GtkWidgets into this expanded_. This
   // should not be a GtkVBox since there were errors with timing where the vbox
   // was horizontally split with the top half displaying the current TabContents
   // and bottom half displaying the loading page.
   GtkWidget* expanded_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContentsContainerGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TAB_CONTENTS_CONTAINER_GTK_H_