Add undeclared virtual destructors part 2...

chrome/installer/util/html_dialog.h

 // Copyright (c) 2006-2008 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_INSTALLER_UTIL_HTML_DIALOG_H_
 #define CHROME_INSTALLER_UTIL_HTML_DIALOG_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 20 matching lines @@
 
   // Callbacks that allow to tweak the appearance of the dialog.
   class CustomizationCallback {
    public:
     // Called before the native window is created. Use it to pass arbitrary
     // parameters in |extra| to the rendering engine.
     virtual void OnBeforeCreation(void** extra) = 0;
     // The native window has been created and is about to be visible. Use it
     // to customize the native |window| appearance.
     virtual void OnBeforeDisplay(void* window) = 0;
+
+    protected:
+     virtual ~CustomizationCallback() {}
   };
 
+  virtual ~HTMLDialog() {}
+
   // Shows the HTML in a modal dialog. The buttons and other UI are also done
   // in HTML so each native implementation needs to map the user action into
   // one of the 6 possible results of DialogResult. Important, call this
   // method only from the main (or UI) thread.
   virtual DialogResult ShowModal(void* parent_window,
                                  CustomizationCallback* callback) = 0;
 
   // If the result of ShowModal() was EXTRA, the information is available
   // as a string using this method.
   virtual std::wstring GetExtraResult() = 0;
-
 };
 
 // Factory method for the native HTML Dialog. When done with the object use
 // regular 'delete' operator to destroy the object. It might choose a
 // different underlying implementation according to the url protocol.
 HTMLDialog* CreateNativeHTMLDialog(const std::wstring& url);
 
 // This class leverages HTMLDialog to create a dialog that is suitable
 // for a end-user-agreement modal dialog. The html shows a fairly standard
 // EULA form with the accept and cancel buttons and an optional check box
@@ skipping 21 matching lines @@
     virtual void OnBeforeDisplay(void* window);
   };
 
   HTMLDialog* dialog_;
   DISALLOW_COPY_AND_ASSIGN(EulaHTMLDialog);
 };
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_HTML_DIALOG_H_