Resolve certificate references in ONC by PEM.

chromeos/test/data/network/wifi_clientcert_with_cert_pems.onc

Index: chromeos/test/data/network/wifi_clientcert_with_cert_pems.onc
diff --git a/chromeos/test/data/network/valid_wifi_clientcert.onc b/chromeos/test/data/network/wifi_clientcert_with_cert_pems.onc
similarity index 84%
rename from chromeos/test/data/network/valid_wifi_clientcert.onc
rename to chromeos/test/data/network/wifi_clientcert_with_cert_pems.onc
index c246a399bd28a7ba84bb078a8c6923b021a09244..32481f0229629ac898d13dd60a999074fd3753f9 100644
--- a/chromeos/test/data/network/valid_wifi_clientcert.onc
+++ b/chromeos/test/data/network/wifi_clientcert_with_cert_pems.onc
@@ -12,9 +12,9 @@
             "UseSystemCAs": true,
             "ClientCertType": "Pattern",
             "ClientCertPattern": {
-                "IssuerCARef": [
-                    "{58ac1967-a0e7-49e9-be68-123abc}",
-                    "{42cb13cd-140c-4941-9fb6-456def}"
+                "IssuerCAPEMs": [
+                    "pem1",
+                    "pem2"
                 ],
                 "EnrollmentURI": [ "chrome-extension://delkjfjibodjclmdijflfnimdmgdagfk/generate-cert.html" ]
             },