Remove all usage of -webkit-*gradient inside blink

Source/devtools/front_end/TimelinePresentationModel.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 1630 matching lines @@
  * @param {!WebInspector.TimelineCategory} category
  */
 WebInspector.TimelinePresentationModel.createStyleRuleForCategory = function(category)
 {
     var selector = ".timeline-category-" + category.name + " .timeline-graph-bar, " +
         ".panel.timeline .timeline-filters-header .filter-checkbox-filter.filter-checkbox-filter-" + category.name + " .checkbox-filter-checkbox, " +
         ".popover .timeline-" + category.name + ", " +
         ".timeline-details-view .timeline-" + category.name + ", " +
         ".timeline-category-" + category.name + " .timeline-tree-icon"
 
-    return selector + " { background-image: -webkit-linear-gradient(" +
+    return selector + " { background-image: linear-gradient(" +
        category.fillColorStop0 + ", " + category.fillColorStop1 + " 25%, " + category.fillColorStop1 + " 25%, " + category.fillColorStop1 + ");" +
        " border-color: " + category.borderColor +
        "}";
 }
 
 
 /**
  * @param {!Object} rawRecord
  * @return {?string}
  */
@@ skipping 222 matching lines @@
         for (var i = 0; i < stackTrace.length; ++i) {
             var stackFrame = stackTrace[i];
             var row = stackTraceElement.createChild("div");
             row.createTextChild(stackFrame.functionName || WebInspector.UIString("(anonymous function)"));
             row.createTextChild(" @ ");
             var urlElement = callFrameLinkifier(stackFrame);
             row.appendChild(urlElement);
         }
     }
 }