net: remove DNS certificate checking code.

net/socket/dns_cert_provenance_checker.h

-// Copyright (c) 2011 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_SOCKET_DNS_CERT_PROVENANCE_CHECKER_H
-#define NET_SOCKET_DNS_CERT_PROVENANCE_CHECKER_H
-
-#include <string>
-#include <vector>
-
-#include "base/string_piece.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-class DnsRRResolver;
-
-// DnsCertProvenanceChecker is an interface for asynchronously checking HTTPS
-// certificates via a DNS side-channel.
-class NET_EXPORT DnsCertProvenanceChecker {
- public:
-  class NET_EXPORT Delegate {
-   public:
-    virtual ~Delegate();
-
-    virtual void OnDnsCertLookupFailed(
-        const std::string& hostname,
-        const std::vector<std::string>& der_certs) = 0;
-  };
-
-  virtual ~DnsCertProvenanceChecker();
-
-  virtual void Shutdown() = 0;
-
-  // DoAsyncVerification starts an asynchronous check for the given certificate
-  // chain. It must be run on the network thread.
-  virtual void DoAsyncVerification(
-      const std::string& hostname,
-      const std::vector<base::StringPiece>& der_certs) = 0;
-
-
- protected:
-  // DoAsyncLookup performs a DNS lookup for the given name and certificate
-  // chain. In the event that the lookup reports a failure, the Delegate is
-  // called back.
-  static void DoAsyncLookup(
-      const std::string& hostname,
-      const std::vector<base::StringPiece>& der_certs,
-      DnsRRResolver* dnsrr_resolver,
-      Delegate* delegate);
-
-  // BuildEncryptedRecord encrypts the certificate chain to a fixed public key
-  // and returns the encrypted blob. Since this code is reporting a possible
-  // HTTPS failure, it would seem silly to use HTTPS to protect the uploaded
-  // report.
-  static std::string BuildEncryptedReport(
-      const std::string& hostname,
-      const std::vector<std::string>& der_certs);
-};
-
-}  // namespace net
-
-#endif  // NET_SOCKET_DNS_CERT_PROVENANCE_CHECK_H