Enable passing cast channel certificate authority keys.

net/cert/x509_certificate.cc

Index: net/cert/x509_certificate.cc
diff --git a/net/cert/x509_certificate.cc b/net/cert/x509_certificate.cc
index 880d487308be1cf7d85f47f7d41efe76739d6320..ee04705ed51743724f326cd02280709a1b3744ea 100644
--- a/net/cert/x509_certificate.cc
+++ b/net/cert/x509_certificate.cc
@@ -709,6 +709,11 @@ bool X509Certificate::GetPEMEncodedChain(
   return true;
 }
 
+const SHA256HashValue X509Certificate::fingerprint256() const {
+  net::X509Certificate::OSCertHandles intermediate;
+  return CalculateChainFingerprint256(os_cert_handle(), intermediate);
+}
+
 // static
 SHA256HashValue X509Certificate::CalculateCAFingerprint256(
     const OSCertHandles& intermediates) {