Virtual destructors should have virtual keyword.

chrome/renderer/spellchecker/spellcheck.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_RENDERER_SPELLCHECKER_SPELLCHECK_H_
 #define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 12 matching lines @@
 
 namespace file_util {
 class MemoryMappedFile;
 }
 
 // TODO(morrita): Needs reorg with SpellCheckProvider.
 // See http://crbug.com/73699.
 class SpellCheck : public RenderProcessObserver {
  public:
   SpellCheck();
-  ~SpellCheck();
+  virtual ~SpellCheck();
 
   void Init(base::PlatformFile file,
             const std::vector<std::string>& custom_words,
             const std::string& language);
 
   // SpellCheck a word.
   // Returns true if spelled correctly, false otherwise.
   // If the spellchecker failed to initialize, always returns true.
   // The |tag| parameter should either be a unique identifier for the document
   // that the word came from (if the current platform requires it), or 0.
@@ skipping 88 matching lines @@
   // This flags whether we have ever been initialized, or have asked the browser
   // for a dictionary. The value indicates whether we should request a
   // dictionary from the browser when the render view asks us to check the
   // spelling of a word.
   bool initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellCheck);
 };
 
 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_