Enable test after DevTools roll

crrev.com/c/2536371 disables a layout test on DevTools console to allow for a change on DevTools' public API to roll. Since the change has been rolled already, this enables the test again and updates it to the new API.

Bug: chromium:1011811
Change-Id: I092b4aa82e90fa0926eb9de9b24b028e13156847
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547304
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Auto-Submit: Andres Olivares <andoli@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829165}

third_party/blink/web_tests/TestExpectations

@@ -5999,9 +5999,6 @@ crbug.com/1150700 [ Win ] virtual/plz-dedicated-worker/external/wpt/service-work
 crbug.com/1130020 virtual/scroll-unification/fast/scrolling/scrollbars/scrollbar-mousedown-move-mouseup.html [ Pass Failure Timeout ]
 crbug.com/1130020 virtual/threaded-prefer-compositing/fast/scrolling/scrollbars/scrollbar-mousedown-move-mouseup.html [ Pass Failure Timeout ]
 
-# DevTools roll
-crbug.com/1011811 http/tests/devtools/console/console-edit-expanded-tree.js [ Skip ]
-
 # Sheriff 2020-11-16
 crbug.com/1149734 http/tests/devtools/sources/debugger-ui/debugger-inline-values-frames.js [ Pass Failure Timeout ]
 crbug.com/1149734 http/tests/devtools/sources/debugger-ui/reveal-execution-line.js [ Pass Failure Timeout ]

third_party/blink/web_tests/http/tests/devtools/console/console-edit-expanded-tree.js

@@ -29,8 +29,9 @@
       var node = message.contentElement();
 
       for (var node = message.contentElement(); node; node = node.traverseNextNode(message.contentElement())) {
-        if (node.treeElement) {
-          onTreeElement(node.treeElement.firstChild());
+        const treeElement = UI.TreeElement.getTreeElementBylistItemNode(node);
+        if (treeElement) {
+          onTreeElement(treeElement.firstChild());
           return;
         }
       }