Add undeclared virtual destructors part 2...

views/controls/link.h

 // Copyright (c) 2010 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 VIEWS_CONTROLS_LINK_H_
 #define VIEWS_CONTROLS_LINK_H_
 
 #include <string>
 
 #include "views/controls/label.h"
 
 namespace views {
 
 class Link;
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // LinkController defines the method that should be implemented to
 // receive a notification when a link is clicked
 //
 ////////////////////////////////////////////////////////////////////////////////
 class LinkController {
  public:
   virtual void LinkActivated(Link* source, int event_flags) = 0;
+
+ protected:
+  virtual ~LinkController() {}
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // Link class
 //
 // A Link is a label subclass that looks like an HTML link. It has a
 // controller which is notified when a click occurs.
 //
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 60 matching lines @@
 
   // The color when the link is neither highlighted nor disabled.
   SkColor normal_color_;
 
   DISALLOW_COPY_AND_ASSIGN(Link);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_LINK_H_