[CSS Grid Layout] Update named grid lines syntax to the last version of the specs

Source/core/css/CSSGridLineNamesValue.cpp

Index: Source/core/css/CSSGridLineNamesValue.cpp
diff --git a/Source/platform/graphics/DisplayList.cpp b/Source/core/css/CSSGridLineNamesValue.cpp
similarity index 78%
copy from Source/platform/graphics/DisplayList.cpp
copy to Source/core/css/CSSGridLineNamesValue.cpp
index c16d3517cdc5bdacec65ff791dc538eec19bfdcc..3a2877d9ae9b7090ff816d53e240f9769e7c06cb 100644
--- a/Source/platform/graphics/DisplayList.cpp
+++ b/Source/core/css/CSSGridLineNamesValue.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2013 Igalia, S.L. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -29,30 +29,24 @@
  */
 
 #include "config.h"
-#include "platform/graphics/DisplayList.h"
-
-#include "third_party/skia/include/core/SkPicture.h"
+#include "core/css/CSSGridLineNamesValue.h"
 
 namespace WebCore {
 
-DisplayList::DisplayList(const FloatRect& bounds)
-    : m_bounds(bounds)
-    , m_picture(adoptRef(new SkPicture()))
+String CSSGridLineNamesValue::customCSSText() const
 {
+    return "(" + CSSValueList::customCSSText() + ")";
 }
 
-DisplayList::~DisplayList()
+CSSGridLineNamesValue::CSSGridLineNamesValue()
+    : CSSValueList(GridLineNamesClass, SpaceSeparator)
 {
 }
 
-const FloatRect& DisplayList::bounds() const
+PassRefPtr<CSSGridLineNamesValue> CSSGridLineNamesValue::cloneForCSSOM() const
 {
-    return m_bounds;
+    return adoptRef(new CSSGridLineNamesValue(*this));
 }
 
-SkPicture* DisplayList::picture() const
-{
-    return m_picture.get();
 }
 
-}