RefCounted types should not have public destructors, webkit/ edition

webkit/database/database_tracker.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 WEBKIT_DATABASE_DATABASE_TRACKER_H_
 #define WEBKIT_DATABASE_DATABASE_TRACKER_H_
 
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 68 matching lines @@
     : public base::RefCountedThreadSafe<DatabaseTracker> {
  public:
   class Observer {
    public:
     virtual void OnDatabaseSizeChanged(const string16& origin_identifier,
                                        const string16& database_name,
                                        int64 database_size) = 0;
     virtual void OnDatabaseScheduledForDeletion(
         const string16& origin_identifier,
         const string16& database_name) = 0;
+
+   protected:
     virtual ~Observer() {}
   };
 
   DatabaseTracker(const FilePath& profile_path,
                   bool is_incognito,
                   quota::SpecialStoragePolicy* special_storage_policy,
                   quota::QuotaManagerProxy* quota_manager_proxy,
                   base::MessageLoopProxy* db_tracker_thread);
 
   void DatabaseOpened(const string16& origin_identifier,
@@ skipping 199 matching lines @@
   // this map to assign directory names that do not reveal this information.
   OriginDirectoriesMap incognito_origin_directories_;
   int incognito_origin_directories_generator_;
 
   FRIEND_TEST_ALL_PREFIXES(DatabaseTracker, TestHelper);
 };
 
 }  // namespace webkit_database
 
 #endif  // WEBKIT_DATABASE_DATABASE_TRACKER_H_