Use dom-if to hide settings pages and show explicitly.

chrome/browser/resources/settings/settings_page/settings_page_visibility.js

Index: chrome/browser/resources/settings/settings_page/settings_page_visibility.js
diff --git a/chrome/browser/resources/settings/settings_page/settings_page_visibility.js b/chrome/browser/resources/settings/settings_page/settings_page_visibility.js
new file mode 100644
index 0000000000000000000000000000000000000000..5e0e752cfbbb1bbc68a1bbcc71476c3ed55bc00f
--- /dev/null
+++ b/chrome/browser/resources/settings/settings_page/settings_page_visibility.js
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+// Copyright 2015 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
+ * Behavior common to all Settings pages
+ *
+ * Example:
+ *   behaviors: [SettingsPageVisibility],
+ *
+ * @group Chrome UI Behavior
+ */
+
+/**
+ * Set this to override page visibility, e.g. in tests.
+ * @type !Object|undefined
+ */
+var SettingPageDefaultVisibility;
+
+/** @polymerBehavior */
+var SettingsPageVisibility = {
+  properties: {
+    /** Dictionary of pages to hide. Includes 'basic' and 'advanced'. */
+    pageVisible: {
+      type: Object,
+      value: SettingPageDefaultVisibility,
+      notify: true,
+    },
+  },
+
+  /**
+   * Sets the visibility for each page in |pages| to true, causing it to load.
+   * @param {!Array<string>} pages
+   */
+  setVisiblePages(pages) {
+    var visible = this.pageVisible || {};
+    for (var p of pages) {
+      visible[p] = true;
+    }
+    this.set('pageVisible', visible);
+  }
+};