Allow normal users to change per session flags.

chrome/browser/resources/flags.css

 /* Copyright (c) 2012 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. */
 
 body {
   margin: 10px;
 <if expr="not pp_ifdef('android')">
   min-width: 47em;
 </if>
   /* Should match needs-restart.height + 5 */
@@ skipping 29 matching lines @@
   background-position: right center;
 }
 
 h1 {
   font-size: 156%;
   font-weight: bold;
   margin: 0;
   padding: 0;
 }
 
-#blurb-container {
+.blurb-container {
   font-size: 120%;
   padding-bottom: 1.5em;
 }
 
 #blurb-warning {
   color: red;
   font-weight: bold;
 }
 
 div.content {
@@ skipping 103 matching lines @@
   padding-right: 15px;
   padding-top: 15px;
   position: fixed;
   width: 100%;
 }
 
 button {
   font-size: 104%;
 }