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

net/base/transport_security_state.h

 // Copyright (c) 2009 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_TRANSPORT_SECURITY_STATE_H_
 #define NET_BASE_TRANSPORT_SECURITY_STATE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 62 matching lines @@
   // parameters are not modified if the function returns |false|.
   static bool ParseHeader(const std::string& value,
                           int* max_age,
                           bool* include_subdomains);
 
   class Delegate {
    public:
     // This function may not block and may be called with internal locks held.
     // Thus it must not reenter the TransportSecurityState object.
     virtual void StateIsDirty(TransportSecurityState* state) = 0;
+
+   protected:
+    virtual ~Delegate() {}
   };
 
   void SetDelegate(Delegate*);
 
   bool Serialise(std::string* output);
   bool Deserialise(const std::string& state, bool* dirty);
 
  private:
   friend class base::RefCountedThreadSafe<TransportSecurityState>;
   FRIEND_TEST(TransportSecurityStateTest, IsPreloaded);
@@ skipping 15 matching lines @@
   static std::string CanonicaliseHost(const std::string& host);
   static bool isPreloadedSTS(const std::string& canonicalised_host,
                              bool* out_include_subdomains);
 
   DISALLOW_COPY_AND_ASSIGN(TransportSecurityState);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_TRANSPORT_SECURITY_STATE_H_