net: allow SSL secrets to be exported sooner.

net/socket/ssl_server_socket_nss.cc

Index: net/socket/ssl_server_socket_nss.cc
diff --git a/net/socket/ssl_server_socket_nss.cc b/net/socket/ssl_server_socket_nss.cc
index c3641733580a5acd0481698c1f084346113e0276..08d84b91cb6ad868be01575431072363761a0709 100644
--- a/net/socket/ssl_server_socket_nss.cc
+++ b/net/socket/ssl_server_socket_nss.cc
@@ -132,9 +132,8 @@ int SSLServerSocketNSS::ExportKeyingMaterial(const base::StringPiece& label,
                                              unsigned int outlen) {
   if (!IsConnected())
     return ERR_SOCKET_NOT_CONNECTED;
-  std::string label_string(label.data(), label.length());
   SECStatus result = SSL_ExportKeyingMaterial(
-      nss_fd_, label_string.c_str(),
+      nss_fd_, label.data(), label.size(),
       reinterpret_cast<const unsigned char*>(context.data()),
       context.length(), out, outlen);
   if (result != SECSuccess) {