Fix misplacement of signin overlay and critical update message banner

ui/login/account_picker/md_user_pod_template.html

 <dom-module id="user-pod-template-shared-styles">
   <template>
     <link rel="stylesheet" href="md_user_pod_template.css">
   </template>
 </dom-module>
 
 <style is="custom-style" include="user-pod-template-shared-styles"></style>
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 
 <iron-iconset-svg name="user-pod" size="24">
   <svg>
     <defs>
       <!--
       Inlined from Polymer's iron-icons to avoid importing everything.
       See http://goo.gl/Y1OdAq for instructions on adding additional icons.
       -->
       <g id="arrow-forward" stroke="none" stroke-width="1">
         <polygon id="arrow" points="10.5 4 9.354375 5.145625 13.888125 9.6875 4 9.6875 4 11.3126 13.888125 11.3125 9.354375 15.854375 10.5 17 17 10.5"></polygon>
       </g>
       <g id="dropdown" fill="#FFFFFF" stroke="none" stroke-width="1" fill-rule="evenodd" opacity="0.34">
         <polygon points="16.59 8.59 12 13.17 7.41 8.59 6 10 12 16 18 10"></polygon>
       </g>
       <g id="legacy-supervised-badge">
         <path d="M16.5,13.5 C17.42,13.5 18.16,12.7533333 18.16,11.8333333 C18.16,10.9133333 17.42,10.1666667 16.5,10.1666667 C15.58,10.1666667 14.8333333,10.9133333 14.8333333,11.8333333 C14.8333333,12.7533333 15.58,13.5 16.5,13.5 Z M11.5,12.8333333 C12.6066667,12.8333333 13.4933333,11.94 13.4933333,10.8333333 C13.4933333,9.72666667 12.6066667,8.83333333 11.5,8.83333333 C10.3933333,8.83333333 9.5,9.72666667 9.5,10.8333333 C9.5,11.94 10.3933333,12.8333333 11.5,12.8333333 Z M16.5,14.8333333 C15.28,14.8333333 12.8333333,15.4466667 12.8333333,16.6666667 L12.8333333,18.1666667 L20.1666667,18.1666667 L20.1666667,16.6666667 C20.1666667,15.4466667 17.72,14.8333333 16.5,14.8333333 Z M11.5,14.1666667 C9.94666667,14.1666667 6.83333333,14.9466667 6.83333333,16.5 L6.83333333,18.1666667 L11.5,18.1666667 L11.5,16.6666667 C11.5,16.1 11.72,15.1066667 13.08,14.3533333 C12.5,14.2333333 11.94,14.1666667 11.5,14.1666667 Z" id="Shape" fill="#000000" fill-rule="nonzero" opacity="0.34"></path>
       </g>
-      <g id="signed-in-badge">
-        <polygon id="Shape" fill="#000000" fill-rule="nonzero" opacity="0.34" points="11.5 16.28 8.72 13.5 7.77333333 14.44 11.5 18.1666667 19.5 10.1666667 18.56 9.22666667"></polygon>
-      </g>
       <g id="caps-lock">
         <path d="M2.5,4.49188419 C2.5,3.39179693 3.39339733,2.5 4.49188419,2.5 L15.5081158,2.5 C16.6082031,2.5 17.5,3.39339733 17.5,4.49188419 L17.5,15.5081158 C17.5,16.6082031 16.6066027,17.5 15.5081158,17.5 L4.49188419,17.5 C3.39179693,17.5 2.5,16.6066027 2.5,15.5081158 L2.5,4.49188419 Z M10,7.47368421 L13.825,11.5 L15,10.2631579 L10,5 L5,10.2631579 L6.175,11.5 L10,7.47368421 Z M5,15 L15,15 L15,13.5 L5,13.5 L5,15 Z" id="Combined-Shape" fill="#FFFFFF"></path>
       </g>
       <g id="public-session-icon">
         <path d="M16,17 L18,17 L18,15 L16,15 L16,17 Z M16,13 L18,13 L18,11 L16,11 L16,13 Z M20,19 L12,19 L12,17 L14,17 L14,15 L12,15 L12,13 L14,13 L14,11 L12,11 L12,9 L20,9 L20,19 Z M8,7 L10,7 L10,5 L8,5 L8,7 Z M8,11 L10,11 L10,9 L8,9 L8,11 Z M8,15 L10,15 L10,13 L8,13 L8,15 Z M8,19 L10,19 L10,17 L8,17 L8,19 Z M4,7 L6,7 L6,5 L4,5 L4,7 Z M4,11 L6,11 L6,9 L4,9 L4,11 Z M4,15 L6,15 L6,13 L4,13 L4,15 Z M4,19 L6,19 L6,17 L4,17 L4,19 Z M12,7 L12,3 L2,3 L2,21 L22,21 L22,7 L12,7 Z" id="Page-1" fill="#FFFFFF"></path>
         <!--<path d="M8,9 L9,9 L9,8 L8,8 L8,9 Z M8,7 L9,7 L9,6 L8,6 L8,7 Z M4,4 L5,4 L5,3 L4,3 L4,4 Z M4,6 L5,6 L5,5 L4,5 L4,6 Z M4,8 L5,8 L5,7 L4,7 L4,8 Z M4,10 L5,10 L5,9 L4,9 L4,10 Z M2,4 L3,4 L3,3 L2,3 L2,4 Z M2,6 L3,6 L3,5 L2,5 L2,6 Z M2,8 L3,8 L3,7 L2,7 L2,8 Z M2,10 L3,10 L3,9 L2,9 L2,10 Z M6,4 L6,2 L1,2 L1,11 L11,11 L11,4 L6,4 Z M10,10 L6,10 L6,9 L7,9 L7,8 L6,8 L6,7 L7,7 L7,6 L6,6 L6,5 L10,5 L10,10 Z" id="Page-1" fill="#FFFFFF"></path>-->
       </g>
     </defs>
   </svg>
 </iron-iconset-svg>
 
 <div id="user-pod-template" class="pod disabled" hidden>
   <div class="large-pod">
     <div class="user-image-pane">
       <div class="user-image-container">
         <img class="user-image" alt>
       </div>
       <div class="badge-container">
         <iron-icon class="legacy-supervised-badge"
             icon="user-pod:legacy-supervised-badge">
         </iron-icon>
-        <iron-icon class="signed-in-badge" icon="user-pod:signed-in-badge">
-        </iron-icon>
       </div>
     </div>
 <if expr="chromeos">
     <div class="pin-container pin-disabled pin-tag">
       <pin-keyboard enable-password hide-input></pin-keyboard>
     </div>
 </if>
     <div class="main-pane">
       <div class="name-container">
         <div class="name"></div>
@@ skipping 188 matching lines @@
           $i18n{publicSessionSelectKeyboard}
         </label>
         <div class="select-container">
           <select class="keyboard-select"></select>
         </div>
       </div>
     </div>
     <div class="enter-button-container">
       <paper-icon-button class="public-account-submit-button enter-button"
           aria-label="$i18n{publicAccountEnterAccessibleName}"
-          icon="user-pod:arrow-forward" tabindex="-1">
+          icon="user-pod:arrow-forward">
       </paper-icon-button>
     </div>
   </div>
 </div>