net: remove DNS certificate checking code.

net/socket/ssl_client_socket.h

Index: net/socket/ssl_client_socket.h
diff --git a/net/socket/ssl_client_socket.h b/net/socket/ssl_client_socket.h
index 64ccd78fe936deabdca35246aab4dc65071c3fbb..e040e386a40c6190df0397f7284c4469d9efb330 100644
--- a/net/socket/ssl_client_socket.h
+++ b/net/socket/ssl_client_socket.h
@@ -17,7 +17,6 @@
 namespace net {
 
 class CertVerifier;
-class DnsCertProvenanceChecker;
 class OriginBoundCertService;
 class SSLCertRequestInfo;
 class SSLHostInfo;
@@ -32,26 +31,22 @@ struct SSLClientSocketContext {
       : cert_verifier(NULL),
         origin_bound_cert_service(NULL),
         transport_security_state(NULL),
-        dns_cert_checker(NULL),
         ssl_host_info_factory(NULL) {}
 
   SSLClientSocketContext(CertVerifier* cert_verifier_arg,
                          OriginBoundCertService* origin_bound_cert_service_arg,
                          TransportSecurityState* transport_security_state_arg,
-                         DnsCertProvenanceChecker* dns_cert_checker_arg,
                          SSLHostInfoFactory* ssl_host_info_factory_arg,
                          const std::string& ssl_session_cache_shard_arg)
       : cert_verifier(cert_verifier_arg),
         origin_bound_cert_service(origin_bound_cert_service_arg),
         transport_security_state(transport_security_state_arg),
-        dns_cert_checker(dns_cert_checker_arg),
         ssl_host_info_factory(ssl_host_info_factory_arg),
         ssl_session_cache_shard(ssl_session_cache_shard_arg) {}
 
   CertVerifier* cert_verifier;
   OriginBoundCertService* origin_bound_cert_service;
   TransportSecurityState* transport_security_state;
-  DnsCertProvenanceChecker* dns_cert_checker;
   SSLHostInfoFactory* ssl_host_info_factory;
   // ssl_session_cache_shard is an opaque string that identifies a shard of the
   // SSL session cache. SSL sockets with the same ssl_session_cache_shard may