[DevTools] Migrate AuditsPanel away from SidebarTree.

third_party/WebKit/LayoutTests/inspector/audits/audits-test.js

 function initialize_AuditTests()
 {
 
 InspectorTest.preloadPanel("audits");
 
 InspectorTest.collectAuditResults = function(callback)
 {
-    WebInspector.panels.audits.showResults(WebInspector.panels.audits.auditResultsTreeElement.firstChild().results);
+    WebInspector.panels.audits.showResults(WebInspector.panels.audits._auditResultsTreeElement.firstChild().results);
     var trees = WebInspector.panels.audits.visibleView.element.querySelectorAll(".audit-result-tree");
     for (var i = 0; i < trees.length; ++i) {
         var liElements = trees[i].shadowRoot.querySelectorAll("li");
         for (var j = 0; j < liElements.length; ++j) {
             if (liElements[j].treeElement)
                 liElements[j].treeElement.expand();
         }
     }
     InspectorTest.deprecatedRunAfterPendingDispatches(function() {
         InspectorTest.collectTextContent(WebInspector.panels.audits.visibleView.element, "");
@@ skipping 32 matching lines @@
             else
                 InspectorTest.collectTextContent(child, indent + " ");
         }
         child = child.nextSibling;
     }
     if (nodeOutput !== "")
         InspectorTest.addResult(indent + nodeOutput);
 }
 
 }