Long options should not break the layout of chrome://flags

components/flags_ui/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 10px 0;
 <if expr="not is_android and not is_ios">
   min-width: 47em;
 </if>
   /* Should be larger than the evaluated height of needs-restart. */
@@ skipping 66 matching lines @@
 
 .section-header > table {
   width: 100%;
 }
 
 .section-header-title {
   font-weight: bold;
   line-height: 200%;
 }
 
+select {
+  max-width: 85vw;
+}
+
 #experiment-reset-all {
   float: right;
 }
 
 html[dir=rtl] #experiment-reset-all {
   float: left;
 }
 
 .vbox-container {
   -webkit-box-orient: vertical;
@@ skipping 82 matching lines @@
   margin-top: 10px;
   padding: 10px 24px;
   text-transform: uppercase;
   transition: box-shadow 200ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 button {
   font-size: 104%;
 }