DevTools: fix nowrap style in the elements panel.

Source/devtools/front_end/elements/elementsTreeOutline.css

 /*
  * Copyright (c) 2014 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.
  */
 
 .outline-disclosure {
     line-height: normal;
 }
 
@@ skipping 243 matching lines @@
     to { background-color: inherit; }
 }
 
 .pick-node-mode {
     cursor: pointer;
 }
 
 .webkit-html-attribute-value a {
     cursor: default !important;
 }
+
+.nowrap {
+    white-space: pre !important;
+}
+
+.nowrap .outline-disclosure li {
+    word-wrap: normal;
+}