Use var to support old browsers

maxnordlund · maxnordlund · commit 95cdba2cde69 · 2017-06-20T10:38:30.000+02:00
diff --git a/autoload.js b/autoload.js
@@ -13,7 +13,7 @@ if (typeof FileReader === "function") (function() {
 
   // --- Begin Definitions ---
 
-  const HIDDEN_FIELD_SYMBOL = Symbol("@@autoFileReader")
+  var HIDDEN_FIELD_SYMBOL = Symbol("@@autoFileReader")
 
   /**
    * AutoFileReader represents the infrastructure to automatically read files
