Virtual destructors should have virtual keyword.

chrome/browser/autocomplete/autocomplete_popup_view_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_AUTOCOMPLETE_AUTOCOMPLETE_POPUP_VIEW_GTK_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_POPUP_VIEW_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 18 matching lines @@
 class SkBitmap;
 
 class AutocompletePopupViewGtk : public AutocompletePopupView,
                                  public NotificationObserver {
  public:
   AutocompletePopupViewGtk(const gfx::Font& font,
                            OmniboxView* omnibox_view,
                            AutocompleteEditModel* edit_model,
                            Profile* profile,
                            GtkWidget* location_bar);
-  ~AutocompletePopupViewGtk();
+  virtual ~AutocompletePopupViewGtk();
 
   // Overridden from AutocompletePopupView:
   virtual bool IsOpen() const;
   virtual void InvalidateLine(size_t line);
   virtual void UpdatePopupAppearance();
   virtual gfx::Rect GetTargetBounds();
   virtual void PaintUpdatesNow();
   virtual void OnDragCanceled();
 
   // Overridden from NotificationObserver:
@@ skipping 82 matching lines @@
   // erroneously ignore the next drag.
   bool ignore_mouse_drag_;
 
   // Whether our popup is currently open / shown, or closed / hidden.
   bool opened_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompletePopupViewGtk);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_POPUP_VIEW_GTK_H_