Completely detach removed nodes.

chrome/test/data/extensions/api_test/automation/tests/tabs/close_tab.js

Index: chrome/test/data/extensions/api_test/automation/tests/tabs/close_tab.js
diff --git a/chrome/test/data/extensions/api_test/automation/tests/tabs/close_tab.js b/chrome/test/data/extensions/api_test/automation/tests/tabs/close_tab.js
index aa04332d65849bcbf2d4987c0051b79023505278..6190449c7ec82602310d390f79034afac2759d1a 100644
--- a/chrome/test/data/extensions/api_test/automation/tests/tabs/close_tab.js
+++ b/chrome/test/data/extensions/api_test/automation/tests/tabs/close_tab.js
@@ -7,12 +7,17 @@ var allTests = [
     getUrlFromConfig('index.html', function(url) {
       chrome.tabs.create({'url': url}, function(tab) {
         chrome.automation.getTree(function(rootNode) {
+          var button = rootNode.find({role: 'button'});
+          assertEq(rootNode, button.root);
+
           rootNode.addEventListener(EventType.destroyed, function() {
             // Poll until the root node doesn't have a role anymore
             // indicating that it really did get cleaned up.
             function checkSuccess() {
-              if (rootNode.role === undefined)
+              if (rootNode.role === undefined && rootNode.root === null) {
+                assertEq(null, button.root);
                 chrome.test.succeed();
+              }
               else
                 window.setTimeout(checkSuccess, 10);
             }