Remove the fingerprint and ca_fingerprint from X509Certificate

ios/web/net/cert_host_pair.cc

 // Copyright 2015 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.
 
 #include "ios/web/net/cert_host_pair.h"
 
 #include "net/cert/x509_certificate.h"
 
 namespace web {
 
 CertHostPair::CertHostPair(const scoped_refptr<net::X509Certificate>& cert,
                            const std::string& host)
-    : cert(cert), host(host) {}
+    : cert(cert),
+      host(host),
+      cert_hash(net::X509Certificate::CalculateChainFingerprint256(
+          cert->os_cert_handle(),
+          cert->GetIntermediateCertificates())) {}
 
 CertHostPair::CertHostPair(const CertHostPair& other) = default;
 
 CertHostPair::~CertHostPair() {}
 
 bool CertHostPair::operator<(const CertHostPair& other) const {
   if (host != other.host)
     return host < other.host;
-  return net::X509Certificate::LessThan()(cert, other.cert);
+  return net::SHA256HashValueLessThan()(cert_hash, other.cert_hash);
 }
 
 }  // web