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

LayoutTests/inspector/elements/elements-panel-styles-expected.txt

 Tests that elements panel shows proper styles in the sidebar panel.
 
 Foo
--webkit-font-smoothing: subpixel-antialiased
-    subpixel-antialiased - element.style
 border-bottom-left-radius: 5px
     5px - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
 border-bottom-right-radius: 5px
     5px - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
 border-top-left-radius: 5px
     5px - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
 border-top-right-radius: 5px
     5px - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
 color: rgb(0, 0, 255)
     blue - .foo, .foo::before elements-panel-styles.css:34 -> elements-panel-styles.css:34:1
@@ skipping 29 matching lines @@
 padding-right: 1px
     1px - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
 padding-top: 4px
     4px - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
 text-align: -webkit-left
     -webkit-left - element.style
 text-indent: 0px
     OVERLOADED 10px - body .foo elements-panel-styles.css:6 -> elements-panel-styles.css:6:1
     0 !important - .foo elements-panel-styles.css:21 -> elements-panel-styles.css:21:1
     OVERLOADED 20px !important - body elements-panel-styles.css:1 -> elements-panel-styles.css:1:1
+-webkit-font-smoothing: subpixel-antialiased
+    subpixel-antialiased - element.style
 [expanded] 
 element.style  { ()
 /-- overloaded --/     display: none;
     -webkit-font-smoothing: subpixel-antialiased;
 
 [expanded] 
 #container .foo  { (elements-panel-styles.css:17 -> elements-panel-styles.css:17:1)
     font-style: italic !important;
 
 [expanded] 
@@ skipping 79 matching lines @@
 .foo::after  { (elements-panel-styles.css:48 -> elements-panel-styles.css:48:1)
     font-family: courier;
     content: "[after Foo 2]";
 
 [expanded] 
 .foo::after  { (elements-panel-styles.css:44 -> elements-panel-styles.css:44:1)
 /-- overloaded --/     content: "[after Foo]";
     color: green;