Virtual destructors should have virtual keyword.

chrome/browser/net/url_request_mock_link_doctor_job.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.
 //
 // A net::URLRequestJob class that substitutes LinkDoctor requests.
 
 #ifndef CHROME_BROWSER_NET_URL_REQUEST_MOCK_LINK_DOCTOR_JOB_H_
 #define CHROME_BROWSER_NET_URL_REQUEST_MOCK_LINK_DOCTOR_JOB_H_
 #pragma once
 
 #include "chrome/browser/net/url_request_mock_http_job.h"
 
 class URLRequestMockLinkDoctorJob : public URLRequestMockHTTPJob {
  public:
   explicit URLRequestMockLinkDoctorJob(net::URLRequest* request);
 
   static net::URLRequest::ProtocolFactory Factory;
 
   // Adds the testing URLs to the net::URLRequestFilter.
   static void AddUrlHandler();
 
  private:
-  ~URLRequestMockLinkDoctorJob() {}
+  virtual ~URLRequestMockLinkDoctorJob() {}
 };
 
 #endif  // CHROME_BROWSER_NET_URL_REQUEST_MOCK_LINK_DOCTOR_JOB_H_