DevTools: [CSSP] put -webkit properties to the end of the list.

Source/devtools/front_end/elements/ComputedStyleWidget.js

Index: Source/devtools/front_end/elements/ComputedStyleWidget.js
diff --git a/Source/devtools/front_end/elements/ComputedStyleWidget.js b/Source/devtools/front_end/elements/ComputedStyleWidget.js
index 974f2cf5154a034c2d926a0c3d60d958971b54d4..7a73e685eb978b80baca47f2282db92b40121551 100644
--- a/Source/devtools/front_end/elements/ComputedStyleWidget.js
+++ b/Source/devtools/front_end/elements/ComputedStyleWidget.js
@@ -188,9 +188,12 @@ WebInspector.ComputedStyleWidget.prototype = {
         /**
          * @param {string} a
          * @param {string} b
+         * @return {number}
          */
         function propertySorter(a, b)
         {
+            if (a.startsWith("-webkit") ^ b.startsWith("-webkit"))
+                return a.startsWith("-webkit") ? 1 : -1;
             var canonicalName = WebInspector.CSSMetadata.canonicalPropertyName;
             return canonicalName(a).compareTo(canonicalName(b));
         }