Fix user deletion button width in user account settings for ChromeOS.

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 20 matching lines @@
   -webkit-margin-start: 10px;
 }
 
 .remove-user-button {
   background-image: url(chrome://theme/IDR_CLOSE_BAR);
   background-color: transparent;
   border: 0;
   width: 16px;
   height: 16px;
   margin-top: 8px;
+  min-width: 16px;
+  padding: 1px 6px 1px 6px;
 }
 
 html[dir=ltr] .remove-user-button {
   float: right;
 }
 
 html[dir=rtl] .remove-user-button {
   float: left;
 }
 
@@ skipping 30 matching lines @@
 #ownerOnlyWarning {
   margin-bottom: 10px;
   -webkit-padding-start: 20px;
   background-repeat: no-repeat;
   background-image: url('warning.png');
 }
 
 input#userNameEdit:invalid {
   background-color: #ff6666;
 }