Update build files.
diff --git a/binding.gyp b/binding.gyp
index 1dd7ee9..4fd2725 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -711,6 +711,7 @@
         'src/core/ext/client_config/client_config_plugin.c',
         'src/core/ext/client_config/connector.c',
         'src/core/ext/client_config/default_initial_connect_string.c',
+        'src/core/ext/client_config/http_connect_handshaker.c',
         'src/core/ext/client_config/initial_connect_string.c',
         'src/core/ext/client_config/lb_policy.c',
         'src/core/ext/client_config/lb_policy_factory.c',