MD Settings: Fix "Check for updates" button regression.

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 64 matching lines @@
         <settings-animated-pages id="pages" section="about">
           <neon-animatable route-path="default">
             <div class="settings-box two-line">
               <img id="product-logo" on-tap="onProductLogoTap_"
                   srcset="chrome://theme/current-channel-logo@1x 1x,
                           chrome://theme/current-channel-logo@2x 2x" alt="">
               <span class="product-title">$i18n{aboutProductTitle}</span>
             </div>
             <div class="settings-box two-line">
               <iron-icon
-                  hidden="[[!shouldShowUpdateStatusIcon_(
-                      obsoleteSystemInfo_, currentUpdateStatusEvent_)]]"
+                  hidden="[[!showUpdateStatus_]]"
                   icon$="[[getIcon_(
                       obsoleteSystemInfo_, currentUpdateStatusEvent_)]]"
                   src="[[getIconSrc_(
                       obsoleteSystemInfo_, currentUpdateStatusEvent_)]]">
               </iron-icon>
               <div class="start">
-                <div id="updateStatusMessage"
-                    hidden="[[!shouldShowUpdateStatusMessage_(
-                        obsoleteSystemInfo_, currentUpdateStatusEvent_)]]"
+                <div id="updateStatusMessage" hidden="[[!showUpdateStatus_]]"
 <if expr="not chromeos">
                     inner-h-t-m-l="[[getUpdateStatusMessage_(
                         currentUpdateStatusEvent_)]]">
 </if>
 <if expr="chromeos">
                     inner-h-t-m-l="[[getUpdateStatusMessage_(
                         currentUpdateStatusEvent_, targetChannel_)]]">
 </if>
                 </div>
                 <span id="deprecationWarning"
                     hidden="[[!obsoleteSystemInfo_.obsolete]]">
                   $i18n{aboutObsoleteSystem}
                   <a href="$i18n{aboutObsoleteSystemURL}" target="_blank">
                     $i18n{learnMore}
                   </a>
                 </span>
                 <div class="secondary copyable">$i18n{aboutBrowserVersion}</div>
               </div>
-              <span id="relaunchContainer"
-<if expr="not chromeos">
-                  hidden="[[!shouldShowRelaunch_(currentUpdateStatusEvent_)]]"
-</if>
-<if expr="chromeos">
-                  hidden="[[!shouldShowRelaunch_(
-                      currentUpdateStatusEvent_, targetChannel_)]]"
-</if>
-                  class="secondary-action">
+              <span id="buttonContainer" class="secondary-action"
+                  hidden="[[!showButtonContainer_]]">
                 <paper-button id="relaunch" class="secondary-button"
-                    on-tap="onRelaunchTap_">
+                    hidden="[[!showRelaunch_]]" on-tap="onRelaunchTap_">
                   $i18n{aboutRelaunch}
                 </paper-button>
 <if expr="chromeos">
                 <paper-button id="relaunchAndPowerwash" class="secondary-button"
-                    hidden="[[!shouldShowRelaunchAndPowerwash_(
-                        currentUpdateStatusEvent_, targetChannel_)]]"
+                    hidden="[[!showRelaunchAndPowerwash_]]"
                     on-tap="onRelaunchAndPowerwashTap_">
                   $i18n{aboutRelaunchAndPowerwash}
                 </paper-button>
                 <paper-button id="checkForUpdates" class="secondary-button"
-                    hidden="[[!shouldShowCheckUpdates_(
-                        currentUpdateStatusEvent_)]]"
+                    hidden="[[!showCheckUpdates_]]"
                     on-tap="onCheckUpdatesTap_">
                   $i18n{aboutCheckForUpdates}
                 </paper-button>
 </if>
               </span>
             </div>
             <div id="help" class="settings-box" on-tap="onHelpTap_" actionable>
               <div class="start">$i18n{aboutGetHelpUsingChrome}</div>
               <button class="icon-external" is="paper-icon-button-light">
               </button>
@@ skipping 43 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>