cros: Clean up screenlockPrivate plumbing.

chrome/browser/resources/login/user_pod_row.js

Index: chrome/browser/resources/login/user_pod_row.js
diff --git a/chrome/browser/resources/login/user_pod_row.js b/chrome/browser/resources/login/user_pod_row.js
index d5e30dc2080916bcc39da6f712193b1cb41330c4..19bd6895157f5ddcc8ff23fb8c2c2fa3638d2b78 100644
--- a/chrome/browser/resources/login/user_pod_row.js
+++ b/chrome/browser/resources/login/user_pod_row.js
@@ -187,9 +187,6 @@ cr.define('login', function() {
             'click',
             this.handleRemoveUserConfirmationClick_.bind(this));
       }
-
-      this.customButtonElement.addEventListener('click',

[Tim Song, 2014/05/16 18:38:47]

It's also worth changing the HTML and CSS, so this isn't a button anymore. This
element should be renamed something more meaningful now that it's not a button.

[xiyuan, 2014/05/16 23:00:56]

CustomButton -> CustomIcon
<button> -> <div>
<img> is removed and icon is shown as the div's background image.

-          this.handleCustomButtonClick_.bind(this));
     },
 
     /**
@@ -881,13 +878,6 @@ cr.define('login', function() {
             this.parentNode.setActivatedPod(this);
           break;
       }
-    },
-
-    /**
-     * Called when the custom button is clicked.
-     */
-    handleCustomButtonClick_: function() {
-      chrome.send('customButtonClicked', [this.user.username]);
     }
   };