Revert of MD Settings: Elim SettingsSubpageBrowsertest and SettingsPageVisibility

chrome/browser/resources/settings/settings_menu/settings_menu.js

Index: chrome/browser/resources/settings/settings_menu/settings_menu.js
diff --git a/chrome/browser/resources/settings/settings_menu/settings_menu.js b/chrome/browser/resources/settings/settings_menu/settings_menu.js
index 8c1fba402731179be2c970afd58a700c4fbf643e..122f10a9f681dec320072f202d7c6b19358c557e 100644
--- a/chrome/browser/resources/settings/settings_menu/settings_menu.js
+++ b/chrome/browser/resources/settings/settings_menu/settings_menu.js
@@ -18,10 +18,12 @@
     },
 
     /**
-     * Dictionary defining page visibility. Controlled by settings-ui.
-     * @type {!PageVisibility|undefined}
+     * Dictionary defining page visibility.
+     * @type {!GuestModePageVisibility}
      */
-    pageVisibility: Object,
+    pageVisibility: {
+      type: Object,
+    },
   },
 
   listeners: {
@@ -43,15 +45,6 @@
     }
 
     this.setSelectedUrl_('');  // Nothing is selected.
-  },
-
-  /**
-   * @param {boolean|undefined} visibility
-   * @return {boolean}
-   * @private
-   */
-  showPage_: function(visibility) {
-    return visibility !== false;
   },
 
   /**