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..5d563af2c04fef937788cf0bcde905c4f6abac4b 100644
--- a/net/cert/ct_verifier.h
+++ b/net/cert/ct_verifier.h
@@ -26,6 +26,7 @@ class NET_EXPORT CTVerifier {
  public:
   class NET_EXPORT Observer {
    public:
+    virtual ~Observer() {}
     // Called for each Signed Certificate Timestamp from a known log that vas
     // verified successfully (i.e. the signature verifies). |sct| is the
     // Signed Certificate Timestamp, |cert| is the certificate it applies to.