place security_connector in its own subdirectory
diff --git a/BUILD b/BUILD
index 31dd9fd..f4f947c 100644
--- a/BUILD
+++ b/BUILD
@@ -1328,10 +1328,10 @@
         "src/core/lib/security/credentials/oauth2/oauth2_credentials.cc",
         "src/core/lib/security/credentials/plugin/plugin_credentials.cc",
         "src/core/lib/security/credentials/ssl/ssl_credentials.cc",
+        "src/core/lib/security/security_connector/security_connector.cc",
         "src/core/lib/security/transport/client_auth_filter.cc",
         "src/core/lib/security/transport/lb_targets_info.cc",
         "src/core/lib/security/transport/secure_endpoint.cc",
-        "src/core/lib/security/transport/security_connector.cc",
         "src/core/lib/security/transport/security_handshaker.cc",
         "src/core/lib/security/transport/server_auth_filter.cc",
         "src/core/lib/security/transport/tsi_error.cc",
@@ -1351,10 +1351,10 @@
         "src/core/lib/security/credentials/oauth2/oauth2_credentials.h",
         "src/core/lib/security/credentials/plugin/plugin_credentials.h",
         "src/core/lib/security/credentials/ssl/ssl_credentials.h",
+        "src/core/lib/security/security_connector/security_connector.h",
         "src/core/lib/security/transport/auth_filters.h",
         "src/core/lib/security/transport/lb_targets_info.h",
         "src/core/lib/security/transport/secure_endpoint.h",
-        "src/core/lib/security/transport/security_connector.h",
         "src/core/lib/security/transport/security_handshaker.h",
         "src/core/lib/security/transport/tsi_error.h",
         "src/core/lib/security/util/json_util.h",