Return the certificate chain in ClientCertStoreNSS.

net/net_common.gypi

Index: net/net_common.gypi
diff --git a/net/net_common.gypi b/net/net_common.gypi
index e5b415313204097deafe9e473c2585ac9b91d31d..014758adb1adb6b4be59f3bf3d48b44d290c165a 100644
--- a/net/net_common.gypi
+++ b/net/net_common.gypi
@@ -203,12 +203,10 @@
         ],
       },
     ],
-    # client_cert_store_nss.c requires NSS_CmpCertChainWCANames from NSS's
-    # libssl, but our bundled copy is not built in OpenSSL ports. Pull that
-    # file in directly.
     [ 'use_nss_certs == 1', {
         'sources': [
-          'third_party/nss/ssl/cmpcert.c',
+          'third_party/nss/ssl/cmpcert.cc',
+          'third_party/nss/ssl/cmpcert.h',
         ],
     }],
     [ 'enable_websockets == 1', {