Virtual destructors should have virtual keyword.

net/url_request/https_prober.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 NET_BASE_HTTPS_PROBER_H_
 #define NET_BASE_HTTPS_PROBER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 48 matching lines @@
   virtual void OnSSLCertificateError(URLRequest* request,
                                      int cert_error,
                                      X509Certificate* cert);
   virtual void OnResponseStarted(URLRequest* request);
   virtual void OnReadCompleted(URLRequest* request, int bytes_read);
 
  private:
   friend struct DefaultSingletonTraits<HTTPSProber>;
 
   HTTPSProber();
-  ~HTTPSProber();
+  virtual ~HTTPSProber();
 
   void Success(URLRequest* request);
   void Failure(URLRequest* request);
   void DoCallback(URLRequest* request, bool result);
 
   std::map<std::string, HTTPSProberDelegate*> inflight_probes_;
   std::set<std::string> probed_;
 
   DISALLOW_COPY_AND_ASSIGN(HTTPSProber);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HTTPS_PROBER_H_