DevTools: Light blue highlight when hovering in Sources Navigator

third_party/WebKit/Source/devtools/front_end/sources/navigatorTree.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 51 matching lines @@
 }
 
 :focus .navigator-folder-tree-item.selected .icon {
     background: white !important;
 }
 
 .tree-outline li {
     min-height: 20px;
 }
 
+.tree-outline li:hover:not(.selected) .selection {
+    display: block;
+    background-color: rgba(56, 121, 217, 0.1);
+}
+
 .navigator-folder-tree-item .icon {
     -webkit-mask-position: -64px -120px;
     background-color: #555;
 }
 
 .navigator-domain-tree-item .icon  {
     -webkit-mask-position: -160px -144px;
 }
 
 .navigator-frame-tree-item .icon {
@@ skipping 36 matching lines @@
 
 .navigator-sm-folder-tree-item .tree-element-title,
 .navigator-sm-script-tree-item .tree-element-title,
 .navigator-sm-stylesheet-tree-item .tree-element-title {
     font-style: italic;
 }
 
 :host{
     overflow-y: auto;
 }