net: remove DNS certificate checking code.

net/url_request/url_request_context.h

Index: net/url_request/url_request_context.h
diff --git a/net/url_request/url_request_context.h b/net/url_request/url_request_context.h
index b3ccd3b74b9fea86345f881ee1a2b233619d4666..7d9d2e6085577888a7d76a1740ab6caf7e56575b 100644
--- a/net/url_request/url_request_context.h
+++ b/net/url_request/url_request_context.h
@@ -25,7 +25,6 @@
 namespace net {
 class CertVerifier;
 class CookieStore;
-class DnsCertProvenanceChecker;
 class FraudulentCertificateReporter;
 class FtpTransactionFactory;
 class HostResolver;
@@ -87,13 +86,6 @@ class NET_EXPORT URLRequestContext
     origin_bound_cert_service_ = origin_bound_cert_service;
   }
 
-  DnsCertProvenanceChecker* dns_cert_checker() const {
-    return dns_cert_checker_;
-  }
-  void set_dns_cert_checker(DnsCertProvenanceChecker* dns_cert_checker) {
-    dns_cert_checker_ = dns_cert_checker;
-  }
-
   FraudulentCertificateReporter* fraudulent_certificate_reporter() const {
     return fraudulent_certificate_reporter_;
   }
@@ -216,7 +208,6 @@ class NET_EXPORT URLRequestContext
   HostResolver* host_resolver_;
   CertVerifier* cert_verifier_;
   OriginBoundCertService* origin_bound_cert_service_;
-  DnsCertProvenanceChecker* dns_cert_checker_;
   FraudulentCertificateReporter* fraudulent_certificate_reporter_;
   HttpAuthHandlerFactory* http_auth_handler_factory_;
   ProxyService* proxy_service_;