Allow text selection in the Security panel main view.

Source/devtools/front_end/security/securityPanel.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-main-view {
+    -webkit-user-select: text;
     margin: 1em;
 }
 
 .security-main-view .lock-icon {
     display: inline-block;
     margin: 0.2em;
     vertical-align: middle;
 }
 
 .security-main-view .security-state {
@@ skipping 16 matching lines @@
 .security-explanation .explanation-title {
     display: inline-block;
     font-size: 1.2em;
     font-weight: bold;
     margin-left: 4px;
 }
 
 .security-explanation .explanation-text {
     margin: 4px 0px;
 }