Remove all usage of -webkit-*gradient inside blink

Source/devtools/front_end/resourcesPanel.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 29 matching lines @@
     height: 18px;
     white-space: nowrap;
 }
 
 .resources.panel .sidebar li.selected {
     color: white;
     text-shadow: rgba(0, 0, 0, 0.33) 1px 1px 0;
 }
 
 .resources.panel .sidebar li.selected .selection {
-    background-image: -webkit-gradient(linear, left top, left bottom, from(rgb(162, 177, 207)), to(rgb(120, 138, 177)));
+    background-image: linear-gradient(to bottom, rgb(162, 177, 207), rgb(120, 138, 177));
     border-top: 1px solid #979797;
     height: 18px;
 }
 
 .resources.panel .sidebar :focus li.selected .selection {
-    background-image: -webkit-gradient(linear, left top, left bottom, from(rgb(92, 147, 213)), to(rgb(21, 83, 170)));
+    background-image: linear-gradient(to bottom, rgb(92, 147, 213), rgb(21, 83, 170));
     border-top: 1px solid rgb(68, 128, 200);
 }
 
 body.inactive .resources.panel .sidebar li.selected .selection {
-    background-image: -webkit-gradient(linear, left top, left bottom, from(rgb(180, 180, 180)), to(rgb(138, 138, 138)));
+    background-image: linear-gradient(to bottom, rgb(180, 180, 180), rgb(138, 138, 138));
     border-top: 1px solid rgb(151, 151, 151);
 }
 
 .resources.panel .sidebar .icon {
     width: 16px;
     height: 16px;
     float: left;
 }
 
 .resources.panel .base-storage-tree-element-title {
@@ skipping 278 matching lines @@
     content: url(Images/cookie.png);
 }
 
 .application-cache-storage-tree-item .icon {
     content: url(Images/applicationCache.png);
 }
 
 .file-system-storage-tree-item .icon {
     content: url(Images/fileSystem.png);
 }