Fix eslint errors. (#5341)

config.js

@@ -514,7 +514,8 @@ var config = {
 
     // Allow all above example options to include a trailing comma and
     // prevent fear when commenting out the last value.
-  make_json_parser_happy: 'even if last key had a trailing comma'
+    makeJsonParserHappy: 'even if last key had a trailing comma'
+
     // no configuration value should follow this line.
 };