Remove all usage of -webkit-*gradient inside blink

Source/core/css/html.css

 /*
  * The default style sheet used to render HTML.
  *
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 897 matching lines @@
 
 meter::-webkit-meter-inner-element {
     -webkit-appearance: inherit;
     box-sizing: inherit;
     -webkit-user-modify: read-only !important;
     height: 100%;
     width: 100%;
 }
 
 meter::-webkit-meter-bar {
-    background: -webkit-gradient(linear, left top, left bottom, from(#ddd), to(#ddd), color-stop(0.20, #eee), color-stop(0.45, #ccc), color-stop(0.55, #ccc));
+    background: linear-gradient(to bottom, #ddd, #eee 20%, #ccc 45%, #ccc 55%, #ddd);
     height: 100%;
     width: 100%;
     -webkit-user-modify: read-only !important;
     box-sizing: border-box;
 }
 
 meter::-webkit-meter-optimum-value {
-    background: -webkit-gradient(linear, left top, left bottom, from(#ad7), to(#ad7), color-stop(0.20, #cea), color-stop(0.45, #7a3), color-stop(0.55, #7a3));
+    background: linear-gradient(to bottom, #ad7, #cea 20%, #7a3 45%, #7a3 55%, #ad7);
     height: 100%;
     -webkit-user-modify: read-only !important;
     box-sizing: border-box;
 }
 
 meter::-webkit-meter-suboptimum-value {
-    background: -webkit-gradient(linear, left top, left bottom, from(#fe7), to(#fe7), color-stop(0.20, #ffc), color-stop(0.45, #db3), color-stop(0.55, #db3));
+    background: linear-gradient(to bottom, #fe7, #ffc 20%, #db3 45%, #db3 55%, #fe7);
     height: 100%;
     -webkit-user-modify: read-only !important;
     box-sizing: border-box;
 }
 
 meter::-webkit-meter-even-less-good-value {
-    background: -webkit-gradient(linear, left top, left bottom, from(#f77), to(#f77), color-stop(0.20, #fcc), color-stop(0.45, #d44), color-stop(0.55, #d44));
+    background: linear-gradient(to bottom, #f77, #fcc 20%, #d44 45%, #d44 55%, #f77);
     height: 100%;
     -webkit-user-modify: read-only !important;
     box-sizing: border-box;
 }
 
 /* progress */
 
 progress {
     -webkit-appearance: progress-bar;
     box-sizing: border-box;
@@ skipping 200 matching lines @@
 @page {
     /* FIXME: Define the right default values for page properties. */
     size: auto;
     margin: auto;
     padding: 0px;
     border-width: 0px;
 }
 
 /* noscript is handled internally, as it depends on settings. */