Fix WiFi config view for previously configured client cert.

chromeos/network/client_cert_util.h

Index: chromeos/network/client_cert_util.h
diff --git a/chromeos/network/client_cert_util.h b/chromeos/network/client_cert_util.h
index 7046ef75f5f827764e97e3f61abf49da352b6340..9e3b0a2de8d66630301dcdcf29e7ae24ab5d3143 100644
--- a/chromeos/network/client_cert_util.h
+++ b/chromeos/network/client_cert_util.h
@@ -63,6 +63,11 @@ CHROMEOS_EXPORT scoped_refptr<net::X509Certificate> GetCertificateMatch(
     const CertificatePattern& pattern,
     const net::CertificateList& all_certs);
 
+// Returns the PKCS11 id part of |cert_id|, which is expected to be the value of
+// the Shill property kEapCertIdProperty or kEapKeyIdProperty.
+CHROMEOS_EXPORT std::string GetPkcs11IdFromEapCertId(
+    const std::string& cert_id);
+
 // If not empty, sets the TPM properties in |properties|. If |pkcs11_id| is not
 // NULL, also sets the ClientCertID. |cert_config_type| determines which
 // dictionary entries to set.