Sync from Piper @334206209

PROTOBUF_SYNC_PIPER
diff --git a/js/message.js b/js/message.js
index f190894..905329f 100644
--- a/js/message.js
+++ b/js/message.js
@@ -31,6 +31,7 @@
 /**
  * @fileoverview Definition of jspb.Message.
  *
+ * @suppress {missingRequire} TODO(b/152540451): this shouldn't be needed
  * @author mwr@google.com (Mark Rawling)
  */