dom_mutation_observer.js

(function (window, checkNode){

  var p = {};
  var m = {
    registerObserver: function() {
      if (typeof(window.WebKitMutationObserver) == "undefined") return;
      
      p.observer = new window.WebKitMutationObserver(function(mutationRecords) {
        mutationRecords.forEach(function(mutationRecord) {
          for (var i = 0; i < mutationRecord.addedNodes.length; ++i)
            m.safeCheckNode(mutationRecord.addedNodes[i]);
        });
      });
      
      p.observer.observe(window.document, {
        subtree: true,  // observe the subtree rooted at myNode
        childList: true,  // include information childNode insertion/removals
        attribute: false  // include information about changes to attributes within the subtree
      });
    },
    safeCheckNode: function(node) {
      try { checkNode(node); }
      catch (e) { }
    }
  };
  m.registerObserver();

})(window, function(node) {
  if (node.id == 'gritter-notice-wrapper')
    node.parentNode.removeChild(node);
});