Remove the fingerprint and ca_fingerprint from X509Certificate

ios/web/net/cert_host_pair.h

Index: ios/web/net/cert_host_pair.h
diff --git a/ios/web/net/cert_host_pair.h b/ios/web/net/cert_host_pair.h
index f251c1b5727dbaba14ea94260b37768c88841471..36075014c4c6da1666db0bc59771b9ca17ba5766 100644
--- a/ios/web/net/cert_host_pair.h
+++ b/ios/web/net/cert_host_pair.h
@@ -7,7 +7,9 @@
 
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
+#include "net/base/hash_value.h"
 
 namespace net {
 class X509Certificate;
@@ -17,16 +19,20 @@ namespace web {
 
 // Holds certificate-host pair. Implements operator less, hence can act as a key
 // for a container.
-struct CertHostPair {
-  CertHostPair(const scoped_refptr<net::X509Certificate>& cert,
-               const std::string& host);
+class CertHostPair {
+ public:
+  CertHostPair(scoped_refptr<net::X509Certificate> cert, std::string host);
   CertHostPair(const CertHostPair& other);
   ~CertHostPair();
 
   bool operator<(const CertHostPair& other) const;
 
-  scoped_refptr<net::X509Certificate> cert;
-  std::string host;
+ private:
+  FRIEND_TEST_ALL_PREFIXES(CertHostPairTest, Construction);
+
+  const scoped_refptr<net::X509Certificate> cert_;
+  const std::string host_;
+  const net::SHA256HashValue cert_hash_;
 };
 
 }  // namespace web