Remove the fingerprint and ca_fingerprint from X509Certificate

ios/web/net/cert_host_pair.cc

Index: ios/web/net/cert_host_pair.cc
diff --git a/ios/web/net/cert_host_pair.cc b/ios/web/net/cert_host_pair.cc
index 569a77b734275f382713f3abdb3870c376b3305e..826608c3ea35a0aac5dcbbaccdc818785aa32daa 100644
--- a/ios/web/net/cert_host_pair.cc
+++ b/ios/web/net/cert_host_pair.cc
@@ -10,7 +10,11 @@ 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;
 
@@ -19,7 +23,7 @@ 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