Remove unused import in message.js.
diff --git a/js/message.js b/js/message.js
index 7adcc25..5ca0a73 100644
--- a/js/message.js
+++ b/js/message.js
@@ -41,7 +41,6 @@
 goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.crypt.base64');
-goog.require('jspb.BinaryConstants');
 goog.require('jspb.BinaryReader');
 goog.require('jspb.Map');