Revert "Enable chrome.automation.getDesktop on all aura platforms."

chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Include test fixture.
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js']);
 
 GEN_INCLUDE(['../../testing/mock_tts.js']);
 
 /**
@@ skipping 51 matching lines @@
 SYNC_TEST_F('BackgroundTest', 'ClassicNamespaces', function() {
   assertEquals('object', typeof(cvox));
   assertEquals('function', typeof(cvox.ChromeVoxBackground));
 });
 
 /** Tests that ChromeVox next is in this context. */
 SYNC_TEST_F('BackgroundTest', 'NextNamespaces', function() {
   assertEquals('function', typeof(Background));
 });
 
+/** Tests that ChromeVox reads the desktop tree. */
+TEST_F('BackgroundTest', 'DesktopFocus', function() {
+  function findStatusTray(root) {
+    if (root.role == chrome.automation.RoleType.button &&
+        root.attributes.name &&
+        root.attributes.name.indexOf('Status tray') != -1) {
+      return root;
+    }
+    for (var i = 0; i < root.children.length; i++) {
+      var found = findStatusTray(root.children[i]);
+      if (found)
+        return found;
+    }
+    return null;
+  }
+
+  chrome.automation.getDesktop(this.newCallback(function(root) {
+    var testButton = findStatusTray(root);
+    cvox.ChromeVox.tts.expectSpeech('Status tray', this.newCallback());
+    testButton.focus();
+  }));
+});
+
 /** Tests feedback once a page loads. */
 TEST_F('BackgroundTest', 'MANUAL_InitialFeedback', function() {
   cvox.ChromeVox.tts.expectSpeech('start', this.newCallback());
 
   this.runWithTab(function() {/*!
     <p>start
     <p>end
   */});
 });
 
@@ skipping 72 matching lines @@
 TEST_F('BackgroundTest', 'MANUAL_ContinuousRead', function() {
   this.runWithLoadedTree(this.linksAndHeadingsDoc, function() {
     cvox.ChromeVox.tts.expectSpeech('start');
     cvox.ChromeVox.tts.expectSpeechAfter('start', this.doCmd('continuousRead'));
     cvox.ChromeVox.tts.expectSpeech('alpha Link');
     cvox.ChromeVox.tts.expectSpeech('beta Link');
     cvox.ChromeVox.tts.expectSpeech('Heading charlie', function() {});
     cvox.ChromeVox.tts.finishExpectations(this.newCallback());
   });
 });