HSTS: add net-internals UI.

chrome/browser/resources/net_internals/main.css

 /*
 Copyright (c) 2010 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.
 */
 
 * {
   box-sizing: border-box;
   -moz-box-sizing: border-box;
 }
@@ skipping 142 matching lines @@
 
 #detailsLogBox,
 #detailsTimelineBox,
 #httpCacheTabContent,
 #proxyTabContent,
 #dataTabContent,
 #dnsTabContent,
 #socketsTabContent,
 #spdyTabContent,
 #serviceProvidersTabContent,
-#testTabContent {
+#testTabContent,
+#hstsTabContent {
   overflow: auto;
   padding: 10px;
 }
 
 #proxyTabContent td,
 #proxyTabContent th {
   font-size: 12px;
 }
 
 /*
@@ skipping 37 matching lines @@
   font-size: 100%;
   font-weight: bold;
 }
 
 /**
  * Styling for text indicating a potential problem or error state.
  */
 .warningText {
   color: red;
 }