Settings Router Refactor: Remove route.page legacy property.

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">
 <link rel="import" href="/settings_page_css.html">
 
 <if expr="chromeos">
 <link rel="import" href="/device_page/device_page.html">
 <link rel="import" href="/internet_page/internet_page.html">
 </if>
 
 <if expr="not chromeos">
 <link rel="import" href="/default_browser_page/default_browser_page.html">
 </if>
 
 <dom-module id="settings-basic-page">
   <template>
     <style include="settings-page-styles"></style>
-    <div data-page="basic">
+    <div>
       <template is="dom-if" if="[[showResetProfileBanner_]]">
         <settings-reset-profile-banner on-reset-done="onResetDone_">
         </settings-reset-profile-banner>
       </template>
 <if expr="chromeos">
       <template is="dom-if" if="[[showPage(pageVisibility.internet)]]" restamp>
         <settings-section page-title="$i18n{internetPageTitle}"
             current-route="[[currentRoute]]" section="internet">
           <settings-internet-page current-route="{{currentRoute}}">
           </settings-internet-page>
@@ skipping 51 matching lines @@
             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>