Security panel origin view: truncate SAN to two entries by default.

Source/devtools/front_end/security/originView.css

 /* Copyright (c) 2015 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.
  */
 
 .security-origin-view {
     overflow-x: hidden;
     overflow-y: scroll;
     display: block;
     -webkit-user-select: text;
@@ skipping 47 matching lines @@
     justify-content: flex-end;
 }
 .security-origin-view .details-table-row > div:nth-child(2) {
     flex: auto;
     white-space: normal;
 }
 
 .security-origin-view .details-table .san-entry {
     display: block;
 }
+
+.security-origin-view .truncated-san .truncated-entry {
+    display: none;
+}