DevTools: Fix Elements tab event listener removal

third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js

 if (window.GCController)
     GCController.collectAll();
 var initialize_InspectorTest = function() {
 
 var results = [];
 
 function consoleOutputHook(messageType)
 {
     InspectorTest.addResult(messageType + ": " + Array.prototype.slice.call(arguments, 1));
 }
@@ skipping 301 matching lines @@
     InspectorTest.addResult(expandedSubstring + " " + treeElement.listItemElement.deepTextContent());
 
     for (var i = 0; i < treeElement.childCount(); ++i) {
         var property = treeElement.childAt(i).property;
         var key = property.name;
         var value = property.value._description;
         InspectorTest.addResult("    " + key + ": " + value);
     }
 }
 
-InspectorTest.expandAndDumpEventListeners = function(eventListenersView, callback)
+InspectorTest.expandAndDumpEventListeners = function(eventListenersView, callback, force)
 {
-    InspectorTest.addSniffer(Components.EventListenersView.prototype, "_eventListenersArrivedForTest", listenersArrived);
-
     function listenersArrived()
     {
         var listenerTypes = eventListenersView._treeOutline.rootElement().children();
         for (var i = 0; i < listenerTypes.length; ++i) {
             listenerTypes[i].expand();
             var listenerItems = listenerTypes[i].children();
             for (var j = 0; j < listenerItems.length; ++j)
                 listenerItems[j].expand();
         }
         InspectorTest.deprecatedRunAfterPendingDispatches(objectsExpanded);
     }
 
     function objectsExpanded()
     {
         var listenerTypes = eventListenersView._treeOutline.rootElement().children();
         for (var i = 0; i < listenerTypes.length; ++i) {
             if (!listenerTypes[i].children().length)
                 continue;
             var eventType = listenerTypes[i]._title;
             InspectorTest.addResult("");
             InspectorTest.addResult("======== " + eventType + " ========");
             var listenerItems = listenerTypes[i].children();
             for (var j = 0; j < listenerItems.length; ++j) {
                 InspectorTest.addResult("== " + listenerItems[j].eventListener().listenerType());
                 InspectorTest.dumpObjectPropertyTreeElement(listenerItems[j]);
             }
         }
         callback();
     }
+
+    if (force)
+        listenersArrived();
+    else
+        InspectorTest.addSniffer(Components.EventListenersView.prototype, "_eventListenersArrivedForTest", listenersArrived);
 }
 
 InspectorTest.dumpNavigatorView = function(navigatorView)
 {
     dumpNavigatorTreeOutline(navigatorView._scriptsTree);
 
     function dumpNavigatorTreeElement(prefix, treeElement)
     {
         var titleText;
         if (treeElement.title instanceof Element)
@@ skipping 853 matching lines @@
     _output("[page] " + text);
 }
 
 function _output(result)
 {
     if (!outputElement)
         createOutputElement();
     outputElement.appendChild(document.createTextNode(result));
     outputElement.appendChild(document.createElement("br"));
 }