Feedback: User email section should only be visible when useful

chrome/browser/resources/feedback/js/feedback.js

 // Copyright 2013 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.
 
 /**
  * @type {string}
  * @const
  */
 var SRT_DOWNLOAD_PAGE = 'https://www.google.com/chrome/cleanup-tool/';
 
@@ skipping 336 matching lines @@
         // Never add an empty option.
         if (!email)
           return;
         var optionElement = document.createElement('option');
         optionElement.value = email;
         optionElement.text = email;
         optionElement.selected = true;
         // Make sure the "Report anonymously" option comes last.
         $('user-email-drop-down').insertBefore(optionElement,
             $('anonymous-user-option'));
+
+        // Now we can unhide the user email section:
+        $('user-email').hidden = false;
       });
 
       // Initiate getting the system info.
       isSystemInfoReady = false;
       getSystemInformation(onSystemInformation);
 
       // An extension called us with an attached file.
       if (feedbackInfo.attachedFile) {
         $('attached-filename-text').textContent =
             feedbackInfo.attachedFile.name;
@@ skipping 80 matching lines @@
     $('cancel-button').onclick = cancel;
     $('remove-attached-file').onclick = clearAttachedFile;
 // <if expr="chromeos">
     $('performance-info-checkbox').addEventListener(
         'change', performanceFeedbackChanged);
 // </if>
   });
 }
 
 initialize();