Added alias getFieldProto3 as used by older generated code.
Un-breaks users who have old generated code and upgrade
to the 3.1.0 release.
diff --git a/js/message.js b/js/message.js
index b150722..8def763 100644
--- a/js/message.js
+++ b/js/message.js
@@ -755,6 +755,18 @@
/**
+ * Alias for getFieldWithDefault used by older generated code.
+ * @template T
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {T} defaultValue The default value.
+ * @return {T} The field's value.
+ * @protected
+ */
+jspb.Message.getFieldProto3 = jspb.Message.getFieldWithDefault;
+
+
+/**
* Gets the value of a map field, lazily creating the map container if
* necessary.
*
