RefCounted types should not have public destructors, net/

net/dns/dns_transaction.cc

Index: net/dns/dns_transaction.cc
diff --git a/net/dns/dns_transaction.cc b/net/dns/dns_transaction.cc
index dd7b659e306d19cf8cd22bc0000ed419d15682b3..ba753026810c0829199909770d5bf3f9fbf721e1 100644
--- a/net/dns/dns_transaction.cc
+++ b/net/dns/dns_transaction.cc
@@ -63,6 +63,9 @@ class StartParameters : public NetLog::EventParameters {
     return dict;
   }
 
+ protected:
+  virtual ~StartParameters() {}
+
  private:
   const std::string hostname_;
   const uint16 qtype_;
@@ -81,6 +84,9 @@ class ResponseParameters : public NetLog::EventParameters {
     return dict;
   }
 
+ protected:
+  virtual ~ResponseParameters() {}
+
  private:
   const int rcode_;
   const int answer_count_;