Instrument "Remove this person" in user manager.

ui/login/account_picker/user_pod_row.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview User pod row implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 1397 matching lines @@
 
       // Move up the menu if it overlaps shelf.
       var maxHeight = cr.ui.LoginUITools.getMaxHeightBeforeShelfOverlapping(
           this.actionBoxMenu);
       var actualHeight = parseInt(
           window.getComputedStyle(this.actionBoxMenu).height);
       if (maxHeight < actualHeight) {
         this.actionBoxMenu.classList.add('menu-moved-up');
         this.actionBoxAreaElement.classList.add('menu-moved-up');
       }
+      chrome.send('logRemoveUserWarningShown');
     },
 
     /**
      * Handles a click event on remove user confirmation button.
      * @param {Event} e Click event.
      */
     handleRemoveUserConfirmationClick_: function(e) {
       if (this.isActionBoxMenuActive) {
         this.isActionBoxMenuActive = false;
         this.removeUser(this.user);
@@ skipping 1723 matching lines @@
        if (pod && pod.multiProfilesPolicyApplied) {
          pod.userTypeBubbleElement.classList.remove('bubble-shown');
        }
      }
   };
 
   return {
     PodRow: PodRow
   };
 });