Remove dangling chrome://theme/IDR_CLOSE_BAR* references

chrome/browser/resources/options2/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 20 matching lines @@
 
 .user-email-name-block {
   -webkit-box-flex: 1;
   max-width: 318px;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
 .remove-user-button {
-  background-image: url(chrome://theme/IDR_CLOSE_BAR);
+  background-image: url('../../../../../ui/resources/close_bar.png');
   width: 16px;
   height: 16px;
 }
 
 .remove-user-button:hover {
-  background-image: url(chrome://theme/IDR_CLOSE_BAR_H);
+  background-image: url('../../../../../ui/resources/close_bar_h.png');
 }
 
 #userList {
   padding: 5px;
   width: 366px;
   height: 166px;
 }
 
 #userList[disabled],
 #userList[disabled] > [selected],
@@ skipping 20 matching lines @@
   margin-bottom: 10px;
   padding-bottom: 1px;
   -webkit-padding-start: 20px;
   background-repeat: no-repeat;
   background-image: url('warning.png');
 }
 
 input#userNameEdit:invalid {
   background-color: #ff6666;
 }