Show entire URLs instead of horizontal scrollbars in about:media-internals

content/browser/resources/media/media_internals.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,
 body,
 #container {
   margin: 0;
   padding: 0;
   width: 100%;
@@ skipping 170 matching lines @@
 label.selectable-button {
   -webkit-user-select: none;
   display: inline-block;
   background: #BDF;
   cursor: pointer;
   border: solid 1px #999;
   border-radius: 3px;
   padding: 6px;
   margin: 4px 0;
   line-height: 1.4;
+  word-break: break-all;
 }
 
 input.selectable-button {
   display: none;
 }
 
 input.selectable-button:checked + label.selectable-button {
   background-color: #2196F3;
   border-color: #666;
   color: #FFF;
@@ skipping 17 matching lines @@
 
 .no-players-selected #players .property-wrapper,
 .no-players-selected #players #log-wrapper {
   display: none;
 }
 
 .no-components-selected #audio .property-wrapper {
   display: none;
 }