Make email field in Feedback app uneditable

chrome/browser/resources/feedback/css/feedback.css

 /* 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. */
 
 
 html {
   height: 100%;
 }
 
 body {
@@ skipping 55 matching lines @@
   display: -webkit-flex;
   height: 29px;
   margin-top: 10px;
 }
 
 .content .text-field-container > label {
   -webkit-flex: 0 1 auto;
   width: 100px;
 }
 
+.content .text-field-container > select {
+  -webkit-padding-start: 5px;
+  border: 1px solid;
+  border-color: #c8c8c8;

[xiyuan, 2017/03/02 18:55:11]

nit: this can fold into the previous line,
i.e. border: 1px solid #c8c8c8;

[afakhry, 2017/03/02 19:04:47]

Done.

+  color: #585858;
+  flex: 1 1 auto;
+  height: 100%;
+}
+
 .content .text-field-container > input[type=text] {
   -webkit-flex: 1 1 auto;
   -webkit-padding-start: 5px;
   border: 1px solid;
   border-color: #c8c8c8;
   color: #585858;
   height: 100%;
 }
 
 .content .text-field-container > input[type=checkbox] {
@@ skipping 109 matching lines @@
   height: 50px;
   margin-bottom: 20px;
   margin-top: 120px;
 }
 
 .srt-body {
   font-size: 14px;
   line-height: 24px;
   margin: 0 40px;
 }