Simplify the accounts options page markup.

chrome/browser/resources/options/chromeos_accounts_options_page.css

 .user-list-table {
   border: 1px solid lightgrey;
   border-collapse: collapse;
   border-spacing: 0;
 }
 
 .user-name-edit-row {
   border: 1px solid lightgrey;
   background-color: #ebeffa;
   padding: 5px;
@@ skipping 62 matching lines @@
   visibility: hidden;
 }
 
 #userNameEdit {
   border: 1px solid lightgrey;
   width: 366px;
 }
 
 #ownerOnlyWarning {
   margin-bottom: 10px;
-}
-
-#ownerOnlyWarning > * {
-  vertical-align: middle;
-}
-
-#warningIcon {
-  width: 17px;
-  height: 17px;
-  display: inline-block;
+  -webkit-padding-start: 20px;
   background-repeat: no-repeat;
   background-image: url('warning.png');
 }
 
 input#userNameEdit:invalid {
   background-color: #ff6666;
 }