Certificate Transparency: Start tracking logs' state

net/cert/ct_verifier.h

Index: net/cert/ct_verifier.h
diff --git a/net/cert/ct_verifier.h b/net/cert/ct_verifier.h
index 46a811a79601d40001756e61a3f5924bbcf3eb4a..f2a223e0cee610683d2bd71794a6306ce164020e 100644
--- a/net/cert/ct_verifier.h
+++ b/net/cert/ct_verifier.h
@@ -35,6 +35,9 @@ class NET_EXPORT CTVerifier {
     // net/) may store the observed |cert| and |sct|.
     virtual void OnSCTVerified(X509Certificate* cert,
                                const ct::SignedCertificateTimestamp* sct) = 0;
+
+   protected:
+    virtual ~Observer() {}
   };
 
   virtual ~CTVerifier() {}