Settings Router Refactor: Replace route.subpage usage with route.path

chrome/browser/resources/settings/about_page/about_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/about_page/about_page_browser_proxy.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/lifetime_browser_proxy.html">
 <link rel="import" href="/route.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_section.html">
 <link rel="import" href="/settings_page_css.html">
@@ skipping 50 matching lines @@
         margin-bottom: 12px;
       }
 
       #regulatoryInfo img {
         width: 330px;
       }
     </style>
     <div>
       <settings-section page-title="$i18n{aboutPageTitle}" section="about">
         <settings-animated-pages id="pages" section="about">
-          <neon-animatable id="main">
+          <neon-animatable route-path="default">
             <div class="settings-box">
               <img id="product-logo"
                   srcset="chrome://theme/current-channel-logo@1x 1x,
                           chrome://theme/current-channel-logo@2x 2x" alt="">
               <span class="product-title">$i18n{aboutProductTitle}</span>
             </div>
             <div class="settings-box two-line">
               <iron-icon
                   hidden="[[!shouldShowUpdateStatusIcon_(
                       currentUpdateStatusEvent_)]]"
@@ skipping 81 matching lines @@
 </if>
             </div>
 <if expr="chromeos">
             <div class="settings-box product-info" id="regulatoryInfo"
                 hidden$="[[!shouldShowRegulatoryInfo_(regulatoryInfo_)]]">
               <img src="[[regulatoryInfo_.url]]" alt="[[regulatoryInfo_.text]]">
             </div>
 </if>
           </neon-animatable>
 <if expr="chromeos">
-          <template is="dom-if" name="detailed-build-info">
+          <template is="dom-if" route-path="/help/details">
             <settings-subpage page-title="$i18n{aboutDetailedBuildInfo}">
               <settings-detailed-build-info></settings-detailed-build-info>
             </settings-subpage>
           </template>
 </if>
         </settings-animated-pages>
       </settings-section>
     </div>
   </template>
   <script src="about_page.js"></script>
 </dom-module>