old_contents: ;(function() {
    var interval = 16;
  
    function Updater() {
      this.updatees = [];
      this.tick = interval;
      this.prev = new Date().getTime();
  
      var self = this;
      var update = function() {
        var now = new Date().getTime();
        self.tick = now - self.prev;
        self.prev = now;
        game.update(); // make sure game updated before everything else
        for (var i = 0; i < self.updatees.length; i++) {
          self.updatees[i].update();
        }
  
        window.requestAnimationFrame(update);
      };
  
      window.requestAnimationFrame(update);
    };
  
    Updater.prototype = {
      add: function(updatee) {
        this.updatees.push(updatee);
      },
  
      remove: function(updatee) {
        for(var i = 0; i < this.updatees.length; i++) {
          if(this.updatees[i] === updatee) {
            this.updatees.splice(i, 1);
            break;
          }
        }
      }
    };
  
    this.Updater = Updater;
  }).call(this);
  
new_contents: ;(function() {
    var interval = 16;
  
    function Updater() {
      this.updatees = [];
      this.tick = interval;
      this.prev = new Date().getTime();
  
      var self = this;
      var requestAnimationFrame = window.requestAnimationFrame
          || window.mozRequestAnimationFrame
          || window.webkitRequestAnimationFrame;
      var update = function() {
        var now = new Date().getTime();
        self.tick = now - self.prev;
        self.prev = now;
        game.update(); // make sure game updated before everything else
        for (var i = 0; i < self.updatees.length; i++) {
          self.updatees[i].update();
        }
  
        requestAnimationFrame(update);
      };
  
      requestAnimationFrame(update);
    };
  
    Updater.prototype = {
      add: function(updatee) {
        this.updatees.push(updatee);
      },
  
      remove: function(updatee) {
        for(var i = 0; i < this.updatees.length; i++) {
          if(this.updatees[i] === updatee) {
            this.updatees.splice(i, 1);
            break;
          }
        }
      }
    };
  
    this.Updater = Updater;
  }).call(this);
  
subject: Check for prefixed versions of requestAnimationFrame