DevTools: Fix Elements tab event listener removal

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

 var initialize_ElementTest = function() {
 
 InspectorTest.preloadPanel("elements");
 
 InspectorTest.inlineStyleSection = function()
 {
     return UI.panels.elements._stylesWidget._sectionBlocks[0].sections[0];
 }
 
 InspectorTest.computedStyleWidget = function()
@@ skipping 425 matching lines @@
 {
     UI.viewManager.showView("elements.eventListeners");
     return self.runtime.sharedInstance(Elements.EventListenersWidget);
 }
 
 InspectorTest.showEventListenersWidget = function()
 {
     return UI.viewManager.showView("elements.eventListeners");
 }
 
-InspectorTest.expandAndDumpSelectedElementEventListeners = function(callback)
+InspectorTest.expandAndDumpSelectedElementEventListeners = function(callback, force)
 {
-    InspectorTest.expandAndDumpEventListeners(InspectorTest.eventListenersWidget()._eventListenersView, callback);
+    InspectorTest.expandAndDumpEventListeners(InspectorTest.eventListenersWidget()._eventListenersView, callback, force);
+}
+
+InspectorTest.removeFirstEventListener = function()
+{
+    var treeOutline = InspectorTest.eventListenersWidget()._eventListenersView._treeOutline;
+    var listenerTypes = treeOutline.rootElement().children();
+    for (var i = 0; i < listenerTypes.length; i++) {
+        var listeners = listenerTypes[i].children();
+        if (listeners.length && !listenerTypes[i].hidden) {
+            listeners[0].eventListener().remove();
+            listeners[0]._removeListenerBar();
+            break;
+        }
+    }
 }
 
 InspectorTest.dumpObjectPropertySectionDeep = function(section)
 {
     function domNodeToString(node) {
         if (node)
             return "'" + node.textContent + "'";
         else
             return "null";
     }
@@ skipping 512 matching lines @@
 InspectorTest.dumpAnimationTimeline = function(timeline)
 {
     for (var ui of timeline._uiAnimations) {
         InspectorTest.addResult(ui.animation().type());
         InspectorTest.addResult(ui._nameElement.innerHTML);
         InspectorTest.addResult(ui._svg.innerHTML);
     }
 }
 
 };