Support generation of EC keys using P256 curve and support ECDSA certs.

webrtc/base/nssstreamadapter.cc

Index: webrtc/base/nssstreamadapter.cc
diff --git a/webrtc/base/nssstreamadapter.cc b/webrtc/base/nssstreamadapter.cc
index 22f2a2e2f47e203e43a1ff9e5d0843e97bd5251a..bb8addf054363e9bd3a2d2d0382e8f13e5c454c0 100644
--- a/webrtc/base/nssstreamadapter.cc
+++ b/webrtc/base/nssstreamadapter.cc
@@ -495,7 +495,7 @@ int NSSStreamAdapter::BeginSSL() {
     }
     rv = SSL_ConfigSecureServer(ssl_fd_, identity->certificate().certificate(),
                                 identity->keypair()->privkey(),
-                                kt_rsa);
+                                identity->keypair()->ssl_kea_type());
     if (rv != SECSuccess) {
       Error("BeginSSL", -1, false);
       return -1;