Clang-format and fixed missing dep.

BUILD

diff --git a/BUILD b/BUILD
index 296bda2..0a7803f 100644
--- a/BUILD
+++ b/BUILD
@@ -144,6 +144,7 @@
         ":upb",
         "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_googletest//:gtest_main",
+        "@com_google_protobuf//:protobuf",
     ],
 )