Revert "Switch Access: Add test for keyboard node."

This reverts commit d22c8914.

Reason for revert: This test continuously fails on linux-chromeos-dbg.
Sample build: https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/20743

Original change's description:
> Switch Access: Add test for keyboard node.
>
> This change adds a test to ensure Switch Access state gets updated
> when the virtual keyboard is opened and closed.
>
> Fixed: 1135248
> AX-Relnotes: N/A
> Change-Id: I1b894bce635f1790cee1111f50992c9136d3ded7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453899
> Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
> Reviewed-by: David Tseng <dtseng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#814745}

TBR=dtseng@chromium.org,akihiroota@chromium.org

Change-Id: Icafd07fedf3f65fb637e8383aaaf57457efc709e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459698Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814993}

chrome/browser/resources/chromeos/accessibility/switch_access/BUILD.gn

@@ -107,7 +107,6 @@ js2gtest("switch_access_extjs_tests") {
     "nodes/basic_node_test.js",
     "nodes/desktop_node_test.js",
     "nodes/group_node_test.js",
-    "nodes/keyboard_node_test.js",
     "nodes/tab_node_test.js",
     "switch_access_predicate_test.js",
     "text_navigation_manager_test.js",

chrome/browser/resources/chromeos/accessibility/switch_access/nodes/keyboard_node_test.js

-// Copyright 2020 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.
-
-GEN_INCLUDE(['../switch_access_e2e_test_base.js']);
-
-/** Test fixture for the keyboard node. */
-SwitchAccessKeyboardNodeTest = class extends SwitchAccessE2ETest {};
-
-TEST_F('SwitchAccessKeyboardNodeTest', 'OpenAndClose', function() {
-  this.runWithLoadedTree('<input type="text"></input>', async (desktop) => {
-    const waitForKeyboardVisibility = async (expectedVisibility) => {
-      return new Promise(resolve => {
-        if (KeyboardRootNode.isVisible_ === expectedVisibility) {
-          resolve();
-          return;
-        }
-
-        const listener = (evt) => {
-          if (evt.target.role === chrome.automation.RoleType.KEYBOARD &&
-              KeyboardRootNode.isVisible_ === expectedVisibility) {
-            resolve();
-          }
-        };
-        desktop.addEventListener(
-            chrome.automation.EventType.STATE_CHANGED, listener);
-      });
-    };
-
-    const input = desktop.find({role: chrome.automation.RoleType.TEXT_FIELD});
-    assertNotNullNorUndefined(input);
-    NavigationManager.instance.moveTo_(input);
-    assertEquals(
-        chrome.automation.RoleType.TEXT_FIELD,
-        NavigationManager.currentNode.role,
-        'Did not successfully move to the input');
-
-    // Open the virtual keyboard and assert focus gets placed on the back
-    // button.
-    NavigationManager.enterKeyboard();
-    await waitForKeyboardVisibility(true);
-    assertTrue(KeyboardRootNode.isVisible_);
-    assertUndefined(KeyboardRootNode.getKeyboardObject().state.invisible);
-    assertTrue(NavigationManager.currentNode instanceof BackButtonNode);
-
-    // Close the virtual keyboard and assert focus moves back to the input.
-    NavigationManager.exitKeyboard();
-    await waitForKeyboardVisibility(false);
-    assertFalse(KeyboardRootNode.isVisible_);
-    assertTrue(KeyboardRootNode.getKeyboardObject().state.invisible);
-    assertEquals(
-        chrome.automation.RoleType.TEXT_FIELD,
-        NavigationManager.currentNode.role,
-        'Did not successfully move to the input');
-  });
-});
\ No newline at end of file