[MD settings] small code health changes

chrome/browser/resources/settings/people_page/sync_page.html

 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-keys/iron-a11y-keys.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-button/paper-radio-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-radio-group/paper-radio-group.html">
 <link rel="import" href="sync_browser_proxy.html">
@@ skipping 40 matching lines @@
           padding: 0;
           /* TODO(scottchen): remove margin once large font properly padded. */
           margin-bottom: 1rem;
         };
       }
 
       #sync-data-types .list-item:not([hidden]) ~ .list-item:not([hidden]) {
         border-top: var(--settings-separator-line);
       }
     </style>
-    <div id="[[pages.SPINNER]]" class="settings-box first"
-        hidden$="[[!isStatus_(pages.SPINNER, pageStatus_)]]">
+    <div id="[[pages_.SPINNER]]" class="settings-box first"
+        hidden$="[[!isStatus_(pages_.SPINNER, pageStatus_)]]">
       $i18n{syncLoading}
     </div>
-    <div id="[[pages.TIMEOUT]]" class="settings-box first"
-        hidden$="[[!isStatus_(pages.TIMEOUT, pageStatus_)]]">
+    <div id="[[pages_.TIMEOUT]]" class="settings-box first"
+        hidden$="[[!isStatus_(pages_.TIMEOUT, pageStatus_)]]">
       $i18n{syncTimeout}
     </div>
-    <div id="[[pages.CONFIGURE]]"
-        hidden$="[[!isStatus_(pages.CONFIGURE, pageStatus_)]]">
+    <div id="[[pages_.CONFIGURE]]"
+        hidden$="[[!isStatus_(pages_.CONFIGURE, pageStatus_)]]">
       <template is="dom-if" if="[[syncPrefs.passphraseRequired]]">
         <div id="existingPassphrase" class="list-frame">
           <div class="list-item">
             <span>
               [[enterPassphrasePrompt_(syncPrefs.passphraseTypeIsCustom)]]
               <a href="$i18nRaw{syncErrorHelpUrl}" target="_blank">
                 $i18n{learnMore}
               </a>
             </span>
           </div>
@@ skipping 240 matching lines @@
                                                          confirmation_)]]">
               $i18n{save}
             </paper-button>
           </div>
         </div>
       </template>
     </div>
   </template>
   <script src="sync_page.js"></script>
 </dom-module>