DevTools: Network Panel: remove a bit of css poison.

Source/devtools/front_end/networkPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 94 matching lines @@
     left: 0;
     right: 0;
     bottom: 0;
     overflow: auto;
 }
 
 .resource-headers-view.visible {
     display: block;
 }
 
-.resource-headers-view .outline-disclosure .parent {
+.resource-headers-view .outline-disclosure > .parent {
     -webkit-user-select: none;
     font-weight: bold;
 }
 
-.resource-headers-view .outline-disclosure .parent .section * {
+.resource-headers-view .outline-disclosure > .parent > .section {
     font-weight: normal;
 }
 
 .resource-headers-view .outline-disclosure .children li {
     white-space: nowrap;
 }
 
 .resource-headers-view .outline-disclosure .caution {
     margin-left: 4px;
     display: inline-block;
@@ skipping 180 matching lines @@
 
 .panel.network .split-view {
     flex: auto;
     position: relative;
 }
 
 .network-filters-header {
     flex: 0 0 23px;
     padding-right: 4px;
 }