Revert of MD Settings: Elim SettingsSubpageBrowsertest and SettingsPageVisibility

chrome/browser/resources/settings/settings_main/settings_main.js

Index: chrome/browser/resources/settings/settings_main/settings_main.js
diff --git a/chrome/browser/resources/settings/settings_main/settings_main.js b/chrome/browser/resources/settings/settings_main/settings_main.js
index 4a2dfc25d5bece549923f462cccd84fbf5d6ac1c..0e43c54e5ec73b337807de8253e9059c24bed270 100644
--- a/chrome/browser/resources/settings/settings_main/settings_main.js
+++ b/chrome/browser/resources/settings/settings_main/settings_main.js
@@ -71,10 +71,17 @@
     },
 
     /**
-     * Dictionary defining page visibility. Controlled by settings-ui.
-     * @type {!PageVisibility|undefined}
-     */
-    pageVisibility: Object,
+     * Dictionary defining page visibility.
+     * @type {!GuestModePageVisibility}
+     */
+    pageVisibility: {
+      type: Object,
+      value: function() {
+        return {};
+      },
+    },
+
+    showAndroidApps: Boolean,
   },
 
   /** @override */