Added shortcut for NW config screen in kiosk.

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

 <div id="error-message" class="step hidden show-offline-error">
   <div class="step-contents">
     <div class="error-header">
       <img alt class="error-icon" src="chrome://theme/IDR_ERROR_NETWORK_OFFLINE">
       <div id="captive-portal-title" i18n-content="captivePortalTitle"
           class="error-title
                  show-with-error-state-portal
                  show-with-error-state-offline"></div>
       <div id="login-error-title" i18n-content="loginErrorTitle"
           class="error-title
                  show-with-error-state-proxy
                  show-with-error-state-auth-ext-timeout
                  show-with-ui-state-local-state-error">
       </div>
+      <div id="kiosk-online-title" i18n-content="kioskOnlineTitle"
+          class="error-title
+                 show-with-error-state-kiosk-online"></div>
     </div>
     <div class="error-body">
+      <div id="kiosk-online-message-body"
+          class="error-message-paragraph
+                 show-with-error-state-kiosk-online">
+        <span i18n-content="kioskOnlineMessageBody"
+            class="show-with-error-state-kiosk-online"></span>
+      </div>
       <div id="offline-message-body"
           class="error-message-paragraph
                  show-with-error-state-offline
                  show-with-error-state-auth-ext-timeout">
         <span id="update-offline-message-text"
             i18n-content="updateOfflineMessageBody"
             class="show-with-ui-state-update"></span>
         <span id="signin-offline-message-text"
             i18n-content="signinOfflineMessageBody"
             class="show-with-ui-state-signin
@@ skipping 41 matching lines @@
                  show-with-ui-state-signin
                  show-with-ui-state-locally-managed
                  show-with-ui-state-kiosk-mode
                  show-with-ui-state-auto-enrollment-error">
         <div id="offline-network-control" class="error-message-paragraph">
           <label for="offline-networks-list-dropdown"
               i18n-content="selectNetwork"
               class="offline-network-list-label
                      show-with-error-state-offline
                      show-with-error-state-proxy
-                     show-with-error-state-auth-timeout"></label>
+                     show-with-error-state-auth-timeout
+                     show-with-error-state-kiosk-online"></label>
           <label for="offline-networks-list-dropdown"
               i18n-content="selectAnotherNetwork"
               class="offline-network-list-label
                      show-with-error-state-portal">
           </label>
           <div class="menu-area">
             <div id="offline-networks-list" class="menu-control"></div>
           </div>
         </div>
       </div>
@@ skipping 21 matching lines @@
       <div id="error-offline-login"
           class="error-message-paragraph offline-login"></div>
       <div id="connecting-indicator"
           class="connecting-indicator error-message-paragraph"></div>
     </div>
   </div>
   <div class="error-controls">
     <div id="error-message-controls" class="step-controls"></div>
   </div>
 </div>