DevTools: remove transform hack on elementsTreeOutline

third_party/WebKit/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.
  */
 
 .elements-disclosure {
     width: 100%;
     display: inline-block;
     line-height: normal;
@@ skipping 99 matching lines @@
 .elements-disclosure li .webkit-html-tag.close {
     margin-left: -12px;
 }
 
 .elements-disclosure > ol {
     position: relative;
     margin: 0;
     cursor: default;
     min-width: 100%;
     min-height: 100%;
-    -webkit-transform: translateZ(0);
     padding-left: 2px;
 }
 
 .elements-disclosure ol:focus li.selected {
     color: white;
 }
 
 .elements-disclosure ol:focus li.parent.selected::before {
     background-color: white;
 }
@@ skipping 228 matching lines @@
     border-color: hsla(0,0%,0%,0.1);
 }
 
 .elements-tree-outline ol.shadow-root {
     border-color: hsla(0,0%,80%,1);
 }
 
 li.selected:not(.always-parent) + ol.children {
     border-color: hsla(216,68%,80%,1) !important;
 }