Polymer upgraded to 1.0 in login flow.

chrome/browser/resources/chromeos/login/screen_gaia_signin.html

 <link rel="import" href="chrome://oobe/custom_elements.html">
 
 <div class="step right hidden" id="gaia-signin" role="group"
     aria-live="polite" hidden>
   <div class="step-contents">
     <div id="gaia-signin-form-container">
       <div id="login-box"><!-- Aligned with the login box in iframe --></div>
       <iframe id="signin-frame" name="signin-frame" hidden
         src="about:blank"
         marginwidth="0"
         marginheight="0"
         frameborder="0"
         scrolling="no"></iframe>
-      <offline-gaia id="offline-gaia" hidden></offline-gaia>
+      <offline-gaia id="offline-gaia" class="fit" hidden></offline-gaia>
     </div>
     <div id="gaia-signin-divider" class="signin-divider" hidden></div>
     <div id="signin-right" hidden>
       <div id="gaia-signin-reason" class="signin-text"></div>
       <div id="createAccount" class="signin-text"></div>
       <div id="guestSignin" class="signin-text"></div>
       <div id="createSupervisedUserPane" class="signin-text">
         <div id="createSupervisedUserSeparator"></div>
         <div id="createSupervisedUserLogo">
           <img src="chrome://theme/IDR_LEGACY_SUPERVISED_USER_ICON">
           <span i18n-content="createSupervisedUserFeatureName"></span>
         </div>
         <div id="createSupervisedUserLinkPlaceholder"></div>
         <div id="createSupervisedUserNoManagerText" hidden></div>
       </div>
       <div id="consumerManagementEnrollment" class="signin-text"></div>
     </div>
   </div>
   <div id="gaia-loading" class="step-loading">
     <div class="throbber"></div>
     <throbber-notice i18n-values="text:gaiaLoadingNewGaia"></throbber-notice>
   </div>
   <notification-card id="gaia-whitelist-error" type="fail"
-      i18n-values="buttonLabel:tryAgainButton;
-                   linkLabel:learnMoreButton">
+      i18n-values="button-label:tryAgainButton;
+                   link-label:learnMoreButton">
   </notification-card>
   <div id="enterprise-info-container" hidden>
     <include src="enterprise_info.html">
   </div>
   <div id="saml-notice-container" hidden>
     <span id="saml-notice-message"></span>
   </div>
-  <button id="back-button-item" is="gaia-icon-button" icon="arrow-back" hidden
-      i18n-values="aria-label:backButton" tabindex="0"></button>
-  <button id="close-button-item" is="gaia-icon-button" icon="close" hidden
-      i18n-values="aria-label:closeButton" tabindex="0"></button>
+  <gaia-icon-button id="back-button-item" icon="arrow-back" hidden
+      i18n-values="aria-label:backButton">
+  </gaia-icon-button>
+  <gaia-icon-button id="close-button-item" icon="close" hidden
+      i18n-values="aria-label:closeButton">
+  </gaia-icon-button>
 </div>