MD Settings: About page, fix bug causing update status message to not update.

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="/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">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
@@ skipping 60 matching lines @@
               <iron-icon
                   hidden="[[!shouldShowUpdateStatusIcon_(
                       currentUpdateStatusEvent_)]]"
                   icon$="[[getIcon_(currentUpdateStatusEvent_)]]"
                   src="[[getIconSrc_(currentUpdateStatusEvent_)]]">
               </iron-icon>
               <div class="start">
                 <div id="updateStatusMessage"
                     hidden="[[!shouldShowUpdateStatusMessage_(
                         currentUpdateStatusEvent_)]]">
+<if expr="not chromeos">
+                  [[getUpdateStatusMessage_(currentUpdateStatusEvent_)]]
+</if>
+<if expr="chromeos">
                   [[getUpdateStatusMessage_(
-                      currentUpdateStatusEvent_,targetChannel)]]
+                      currentUpdateStatusEvent_, targetChannel_)]]
+</if>
                 </div>
                 <span id="deprecationWarning"
                     hidden="[[!obsoleteSystemInfo_.obsolete]]">
                   $i18n{aboutObsoleteSystem}
                   <a href="$i18n{aboutObsoleteSystemURL}" target="_blank">
                     $i18n{learnMore}
                   </a>
                 </span>
                 <div class="secondary">$i18n{aboutBrowserVersion}</div>
               </div>
@@ skipping 66 matching lines @@
               <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>