[Settings] Hide Chromevox settings subpage in kiosk mode

We are under discussions about the state of chromevox settings page.
Let's hide it for now.

Bug: 1061068
Change-Id: I21c0f184ee44e5cc9d60b81d731e9dd19148740a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199268
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768583}

chrome/browser/resources/settings/chromeos/os_a11y_page/manage_a11y_page.html

@@ -51,11 +51,13 @@
         pref="{{prefs.settings.accessibility}}"
         label="$i18n{chromeVoxLabel}">
     </settings-toggle-button>
-    <iron-collapse opened="[[prefs.settings.accessibility.value]]">
-      <cr-link-row id="chromeVoxSubpageButton"
-          class="settings-box" on-click="onChromeVoxSettingsTap_"
-          label="$i18n{chromeVoxOptionsLabel}" external></cr-link-row>
-    </iron-collapse>
+    <template is="dom-if" if="[[!isKioskModeActive_]]">
+      <iron-collapse opened="[[prefs.settings.accessibility.value]]">
+        <cr-link-row id="chromeVoxSubpageButton"
+            class="settings-box" on-click="onChromeVoxSettingsTap_"
+            label="$i18n{chromeVoxOptionsLabel}" external></cr-link-row>
+      </iron-collapse>
+    </template>
     <settings-toggle-button
         pref="{{prefs.settings.a11y.select_to_speak}}"
         class="hr"

chrome/test/data/webui/settings/chromeos/manage_accessibility_page_tests.js

@@ -97,9 +97,7 @@ suite('ManageAccessibilityPageTests', function() {
     // Accessibility learn more link should be hidden.
     assertFalse(isVisible(page.$$('setings-localized-link')));
 
-    const allowed_subpages = [
-      'chromeVoxSubpageButton', 'selectToSpeakSubpageButton', 'ttsSubpageButton'
-    ];
+    const allowed_subpages = ['selectToSpeakSubpageButton', 'ttsSubpageButton'];
 
     const subpages = page.root.querySelectorAll('cr-link-row');
     subpages.forEach(function(subpage) {