Fix 'Automatic name servers' display in Settings'

If 'Automatic' is not the current name server selection we should show
the saved values instead of the current values.

BUG=417387

Review URL: https://codereview.chromium.org/647713004

Cr-Commit-Position: refs/heads/master@{#300715}

chrome/browser/resources/options/chromeos/internet_detail.js

@@ -1377,7 +1377,10 @@ cr.define('options.internet', function() {
       else if (staticNameServersString == inetNameServersString)
         nameServerType = 'user';
     }
-    $('automatic-dns-display').textContent = inetNameServersString;
+    if (nameServerType == 'automatic')
+      $('automatic-dns-display').textContent = inetNameServersString;
+    else
+      $('automatic-dns-display').textContent = savedNameServersString;
     $('google-dns-display').textContent = GoogleNameServersString;
 
     var nameServersUser = [];