Revert "Add tests for accessibility pages in Chrome / Chrome OS settings."

This reverts commit 523c07e8.

Reason for revert: SettingsAccessibilityTest.MANAGE_ACCESSIBILITY_aria_valid_attr_value is Flaky.

Original change's description:
> Add tests for accessibility pages in Chrome / Chrome OS settings.
> 
> Bug: 823359
> Change-Id: I62707b079f9ee899feb7c624a498c5f16f6fe061
> Reviewed-on: https://chromium-review.googlesource.com/988226
> Reviewed-by: Hector Carmona <hcarmona@chromium.org>
> Commit-Queue: Katie Dektar <katie@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#547747}

TBR=hcarmona@chromium.org,katie@chromium.org

Change-Id: I4c26092b8c2be2ee2a041a5ac420b57fe5b72a60
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 823359
Reviewed-on: https://chromium-review.googlesource.com/995553Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548053}

chrome/test/data/webui/BUILD.gn

@@ -81,15 +81,12 @@ js2gtest("browser_tests_js_webui") {
     "polymer_browser_test_base.js",
     "sandboxstatus_browsertest.js",
     "settings/a11y/about_a11y_test.js",
-    "settings/a11y/accessibility_a11y_test.js",
     "settings/a11y/basic_a11y_test.js",
     "settings/a11y/edit_dictionary_a11y_test.js",
-    "settings/a11y/manage_accessibility_a11y_test.js",
     "settings/a11y/manage_profile_a11y_test.js",
     "settings/a11y/passwords_a11y_test.js",
     "settings/a11y/settings_accessibility_test.js",
     "settings/a11y/sign_out_a11y_test.js",
-    "settings/a11y/tts_subpage_a11y_test.js",
     "settings/advanced_page_browsertest.js",
     "settings/animation_browsertest.js",
     "settings/basic_page_browsertest.js",

chrome/test/data/webui/settings/a11y/accessibility_a11y_test.js

-// Copyright 2017 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.
-
-/**
- * @fileoverview Define accessibility tests for the ACCESSIBILITY route.
- */
-
-// SettingsAccessibilityTest fixture.
-GEN_INCLUDE([
-  'settings_accessibility_test.js',
-]);
-
-AccessibilityTest.define('SettingsAccessibilityTest', {
-  /** @override */
-  name: 'ACCESSIBILITY',
-  /** @override */
-  axeOptions: SettingsAccessibilityTest.axeOptions,
-  /** @override */
-  setup: function() {
-    settings.router.navigateTo(settings.routes.ACCESSIBILITY);
-    Polymer.dom.flush();
-  },
-  /** @override */
-  tests: {'Accessible with No Changes': function() {}},
-  /** @override */
-  violationFilter: SettingsAccessibilityTest.violationFilter,
-});

chrome/test/data/webui/settings/a11y/manage_accessibility_a11y_test.js

-// Copyright 2017 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.
-
-/**
- * @fileoverview Define accessibility tests for the MANAGE_ACCESSIBILITY route.
- */
-
-// This is only for Chrome OS.
-GEN('#if defined(OS_CHROMEOS)');
-
-// SettingsAccessibilityTest fixture.
-GEN_INCLUDE([
-  'settings_accessibility_test.js',
-]);
-
-AccessibilityTest.define('SettingsAccessibilityTest', {
-  /** @override */
-  name: 'MANAGE_ACCESSIBILITY',
-  /** @override */
-  axeOptions: SettingsAccessibilityTest.axeOptions,
-  /** @override */
-  setup: function() {
-    settings.router.navigateTo(settings.routes.MANAGE_ACCESSIBILITY);
-    Polymer.dom.flush();
-  },
-  /** @override */
-  tests: {'Accessible with No Changes': function() {}},
-  /** @override */
-  violationFilter: SettingsAccessibilityTest.violationFilter,
-});
-
-GEN('#endif  // defined(OS_CHROMEOS)');

chrome/test/data/webui/settings/a11y/sign_out_a11y_test.js

@@ -78,4 +78,4 @@ AccessibilityTest.define('SettingsA11ySignOut', {
   violationFilter: SettingsAccessibilityTest.violationFilter,
 });
 
-GEN('#endif  // !defined(OS_CHROMEOS)');
+GEN('#endif  // defined(OS_CHROMEOS)');

chrome/test/data/webui/settings/a11y/tts_subpage_a11y_test.js

-// Copyright 2017 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.
-
-/**
- * @fileoverview Define accessibility tests for the MANAGE_TTS_SETINGS route.
- */
-
-// This is only for Chrome OS.
-GEN('#if defined(OS_CHROMEOS)');
-
-// SettingsAccessibilityTest fixture.
-GEN_INCLUDE([
-  'settings_accessibility_test.js',
-]);
-
-TtsAccessibilityTest = class extends SettingsAccessibilityTest {
-  /** @override */
-  get commandLineSwitches() {
-    return ['enable-experimental-a11y-features'];
-  }
-};
-
-AccessibilityTest.define('TtsAccessibilityTest', {
-  /** @override */
-  name: 'MANAGE_TTS_SETTINGS',
-  /** @override */
-  axeOptions: SettingsAccessibilityTest.axeOptions,
-  /** @override */
-  setup: function() {
-    settings.router.navigateTo(settings.routes.MANAGE_TTS_SETTINGS);
-    Polymer.dom.flush();
-  },
-  /** @override */
-  tests: {'Accessible with No Changes': function() {}},
-  /** @override */
-  violationFilter: SettingsAccessibilityTest.violationFilter,
-});
-
-GEN('#endif  // defined(OS_CHROMEOS)');