GTTF: Add missing virtual destructors.

chrome/browser/spellchecker/spellcheck_hunspell_dictionary.h

 // Copyright (c) 2012 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_SPELLCHECKER_SPELLCHECK_HUNSPELL_DICTIONARY_H_
 #define CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HUNSPELL_DICTIONARY_H_
 
 #include "chrome/browser/spellchecker/spellcheck_dictionary.h"
 
 #include "base/file_path.h"
@@ skipping 24 matching lines @@
     virtual void OnHunspellDictionaryInitialized() = 0;
 
     // Dictionary download began.
     virtual void OnHunspellDictionaryDownloadBegin() = 0;
 
     // Dictionary download succeeded.
     virtual void OnHunspellDictionaryDownloadSuccess() = 0;
 
     // Dictionary download failed.
     virtual void OnHunspellDictionaryDownloadFailure() = 0;
+
+   protected:
+    virtual ~Observer() { }
   };
 
   // TODO(rlp): Passing in the host is very temporary. In the next CL this
   // will be removed.
   SpellcheckHunspellDictionary(
       Profile* profile,
       const std::string& language,
       net::URLRequestContextGetter* request_context_getter,
       SpellcheckService* spellcheck_service);
   virtual ~SpellcheckHunspellDictionary();
@@ skipping 98 matching lines @@
   // Observers of Hunspell dictionary events.
   ObserverList<Observer> observers_;
 
   // Status of the dictionary download.
   DownloadStatus download_status_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellcheckHunspellDictionary);
 };
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HUNSPELL_DICTIONARY_H_