[ChromeOS] Add an extra stage to remove a user in WebUI login.

chrome/browser/resources/chromeos/login/user_pod_row.css

Index: chrome/browser/resources/chromeos/login/user_pod_row.css
diff --git a/chrome/browser/resources/chromeos/login/user_pod_row.css b/chrome/browser/resources/chromeos/login/user_pod_row.css
index 8ffc03152d591b22328c8ad9d9ece6020b461710..670efdc3061a558ea35b17372ff6fcf043a3a95b 100644
--- a/chrome/browser/resources/chromeos/login/user_pod_row.css
+++ b/chrome/browser/resources/chromeos/login/user_pod_row.css
@@ -135,6 +135,7 @@ podrow {
 }
 
 .remove-user-button {
+  -webkit-transition: width .1s ease-in-out, background .2s ease-in-out;
   -webkit-box-shadow: none;
   background: url('chrome://theme/IDR_CLOSE_BAR') center center no-repeat;
   border: 0;
@@ -152,3 +153,14 @@ podrow {
   -webkit-box-shadow: none;
   background: url('chrome://theme/IDR_CLOSE_BAR_H') center center no-repeat;
 }
+
+.remove-user-button.active {
+  background-color: #e94949;
+  background-image: none;
+  border-radius: 4px;
+  color: white;
+  font-size: 10px;
+  height: initial;
+  padding: 2px 4px;
+  width: initial;
+}