Break config_default into master_site_configs.

masters/master.tryserver.nacl/master_site_config.py

Index: masters/master.tryserver.nacl/master_site_config.py
diff --git a/masters/master.tryserver.nacl/master_site_config.py b/masters/master.tryserver.nacl/master_site_config.py
new file mode 100644
index 0000000000000000000000000000000000000000..18cfeaf45abcc2ff6dd6241ab02d4f190ad16113
--- /dev/null
+++ b/masters/master.tryserver.nacl/master_site_config.py
@@ -0,0 +1,15 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""ActiveMaster definition."""
+
+from config import Master
+
+class NativeClientTryServer(Master.Master4):
+  project_name = 'NativeClient-Try'
+  master_port = 8029
+  slave_port = 8129
+  master_port_alt = 8229
+  try_job_port = 8329
+  svn_url = 'svn://svn.chromium.org/chrome-try/try-nacl'