Fix memory leak in extension pref store...

chrome/browser/extensions/extension_pref_store.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_PREF_STORE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREF_STORE_H_
 
 #include <list>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/scoped_ptr.h"
 #include "chrome/common/pref_store.h"
 
 class DictionaryValue;
 class PrefService;
 class Value;
 
 // This PrefStore keeps track of preferences set by extensions: for example,
 // proxy settings. A stack of relevant extension IDs is stored in order of
 // their addition to this PrefStore. For each preference, the last-added
 // enabled extension that tries to set it overrules any others.
 class ExtensionPrefStore : public PrefStore {
  public:
   explicit ExtensionPrefStore(PrefService* pref_service);
-  virtual ~ExtensionPrefStore() {}
+  virtual ~ExtensionPrefStore();
 
   // The PrefService creates the ExtensionPrefStore, so we need to be able to
   // defer setting the PrefService here until after construction.
   void SetPrefService(PrefService* pref_service) {
     pref_service_ = pref_service;
   }
 
   // Begins tracking the preference and value an extension wishes to set. This
   // must be called each time an extension API tries to set a preference.
   virtual void InstallExtensionPref(std::string extension_id,
@@ skipping 40 matching lines @@
   };
 
   // A pseudo-stack of extensions and their preferences. Extensions are always
   // added to the head, but may be removed from the middle. This stack owns
   // the values in the extensions' PrefValueMaps.
   typedef std::list<ExtensionPrefs*> ExtensionStack;
   ExtensionStack extension_stack_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREF_STORE_H_