Issue 6559 - Replace fromObject with fromMap

test/subscriptionClasses.js

Index: test/subscriptionClasses.js
===================================================================
--- a/test/subscriptionClasses.js
+++ b/test/subscriptionClasses.js
@@ -42,23 +42,23 @@
   expected.push("[Subscription]");
   let subscription = Subscription.fromURL(url);
   if (postInit)
     postInit(subscription);
   let result = [];
   subscription.serialize(result);
   test.equal(result.sort().join("\n"), expected.sort().join("\n"), url);
 
-  let map = Object.create(null);
+  let map = new Map();
   for (let line of result.slice(1))
   {
     if (/(.*?)=(.*)/.test(line))
-      map[RegExp.$1] = RegExp.$2;
+      map.set(RegExp.$1, RegExp.$2);
   }
-  let subscription2 = Subscription.fromObject(map);
+  let subscription2 = Subscription.fromMap(map);
   test.equal(subscription.toString(), subscription2.toString(), url + " deserialization");
 }
 
 exports.testSubscriptionClassDefinitions = function(test)
 {
   test.equal(typeof Subscription, "function", "typeof Subscription");
   test.equal(typeof SpecialSubscription, "function", "typeof SpecialSubscription");
   test.equal(typeof RegularSubscription, "function", "typeof RegularSubscription");