Virtual destructors should have virtual keyword.

chrome/browser/printing/print_job_manager.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_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_
 #pragma once
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/prefs/pref_member.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 
 class PrefService;
 
 namespace printing {
 
 class JobEventDetails;
 class PrintedDocument;
 class PrintJob;
 class PrintedPage;
 class PrinterQuery;
 
 class PrintJobManager : public NotificationObserver {
  public:
   PrintJobManager();
-  ~PrintJobManager();
+  virtual ~PrintJobManager();
 
   // Registers for changes to the printing enabled preference in |prefs|.
   // This method should be called on the UI thread.
   void InitOnUIThread(PrefService* prefs);
 
   // On browser quit, we should wait to have the print job finished.
   void OnQuit();
 
   // Stops all printing jobs. If wait_for_finish is true, tries to give jobs
   // a chance to complete before stopping them.
@@ skipping 42 matching lines @@
 
   // Current print jobs that are active.
   PrintJobs current_jobs_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintJobManager);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_