MD Settings: Remove some unhelpful properties

chrome/browser/resources/settings/about_page/about_page.js

Index: chrome/browser/resources/settings/about_page/about_page.js
diff --git a/chrome/browser/resources/settings/about_page/about_page.js b/chrome/browser/resources/settings/about_page/about_page.js
index 50861b9cdbaab823e0c2e7769acc39753ee36941..07d8eaa857006e28409964ad66182ee06d85ae13 100644
--- a/chrome/browser/resources/settings/about_page/about_page.js
+++ b/chrome/browser/resources/settings/about_page/about_page.js
@@ -55,13 +55,6 @@ Polymer({
   /** @private {?settings.LifetimeBrowserProxy} */
   lifetimeBrowserProxy_: null,
 
-  /**
-   * @type {string} Selector to get the sections.
-   * TODO(michaelpg): replace duplicate docs with @override once b/24294625
-   * is fixed.
-   */
-  sectionSelector: 'settings-section',
-
   /** @override */
   attached: function() {
     this.aboutBrowserProxy_ = settings.AboutPageBrowserProxyImpl.getInstance();