MD Settings: Remove some unhelpful properties

chrome/browser/resources/settings/basic_page/basic_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/appearance_page/appearance_page.html">
 <link rel="import" href="/search_page/search_page.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_page/settings_page_visibility.html">
 <link rel="import" href="/settings_page/settings_router.html">
 <link rel="import" href="/settings_page/settings_section.html">
 <link rel="import" href="/on_startup_page/on_startup_page.html">
 <link rel="import" href="/people_page/people_page.html">
 <link rel="import" href="/reset_page/reset_profile_banner.html">
@@ skipping 57 matching lines @@
         <settings-section page-title="$i18n{searchPageTitle}"
             current-route="[[currentRoute]]" section="search">
           <settings-search-page current-route="{{currentRoute}}">
           </settings-search-page>
         </settings-section>
       </template>
 <if expr="not chromeos">
       <template is="dom-if" if="[[showPage(pageVisibility.defaultBrowser)]]"
           restamp>
         <settings-section page-title="$i18n{defaultBrowser}"
-            expand-container="{{expandContainer}}"
             current-route="[[currentRoute]]" section="defaultBrowser">
           <settings-default-browser-page>
           </settings-default-browser-page>
         </settings-section>
       </template>
 </if>
       <template is="dom-if" if="[[showPage(pageVisibility.onStartup)]]" restamp>
         <settings-section page-title="$i18n{onStartup}"
             current-route="[[currentRoute]]" section="onStartup">
           <settings-on-startup-page prefs="{{prefs}}"
               current-route="{{currentRoute}}">
           </settings-on-startup-page>
         </settings-section>
       </template>
     </div>
   </template>
   <script src="basic_page.js"></script>
 </dom-module>