Add virtual to some base classes that have virtual methods...

net/url_request/https_prober.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 NET_BASE_HTTPS_PROBER_H_
 #define NET_BASE_HTTPS_PROBER_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/singleton.h"
 #include "base/task.h"
 #include "net/url_request/url_request.h"
 
 class URLRequestContext;
 
 namespace net {
 
 // This should be scoped inside HTTPSProber, but VC cannot compile
 // HTTPProber::Delegate when HTTPSProber also inherits from
 // URLRequest::Delegate.
 class HTTPSProberDelegate {
  public:
   virtual void ProbeComplete(bool result) = 0;
+ protected:
+  virtual ~HTTPSProberDelegate() {}
 };
 
 // HTTPSProber is a singleton object that manages HTTPS probes. A HTTPS probe
 // determines if we can connect to a given host over HTTPS. It's used when
 // transparently upgrading from HTTP to HTTPS (for example, for SPDY).
 class HTTPSProber : public URLRequest::Delegate {
  public:
-  HTTPSProber() { }
+  HTTPSProber() {}
 
   // HaveProbed returns true if the given host is known to have been probed
   // since the browser was last started.
   bool HaveProbed(const std::string& host) const;
 
   // InFlight returns true iff a probe for the given host is currently active.
   bool InFlight(const std::string& host) const;
 
   // ProbeHost starts a new probe for the given host. If the host is known to
   // have been probed since the browser was started, false is returned and no
@@ skipping 20 matching lines @@
 
   std::map<std::string, HTTPSProberDelegate*> inflight_probes_;
   std::set<std::string> probed_;
 
   friend struct DefaultSingletonTraits<HTTPSProber>;
   DISALLOW_COPY_AND_ASSIGN(HTTPSProber);
 };
 
 }  // namespace net
 #endif