Revert "Stop AJAX updater consuming ever-increasing memory"

app/assets/javascripts/updateContent.js

@@ -3,16 +3,11 @@
 
   var queues = {};
   var dd = new diffDOM();
-  var timer;
 
-  var getRenderer = $component => response => function() {
-    var component = $component.get(0);
-    var updated = $(response[$component.data('key')]).get(0);
-    var diff = dd.diff(component, updated);
-    dd.apply(
-      component, diff
-    );
-  };
+  var getRenderer = $component => response => dd.apply(
+    $component.get(0),
+    dd.diff($component.get(0), $(response[$component.data('key')]).get(0))
+  );
 
   var getQueue = resource => (
     queues[resource] = queues[resource] || []
@@ -34,7 +29,7 @@
       () => clearQueue(queue)
     );
 
-    timer = setTimeout(
+    setTimeout(
       () => poll(...arguments), interval
     );