[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/core/css/CSSGridLineNamesValue.cpp b/Source/core/css/CSSGridLineNamesValue.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3a2877d9ae9b7090ff816d53e240f9769e7c06cb
--- /dev/null
+++ b/Source/core/css/CSSGridLineNamesValue.cpp
@@ -0,0 +1,52 @@
+/*
+ * 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
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/css/CSSGridLineNamesValue.h"
+
+namespace WebCore {
+
+String CSSGridLineNamesValue::customCSSText() const
+{
+    return "(" + CSSValueList::customCSSText() + ")";
+}
+
+CSSGridLineNamesValue::CSSGridLineNamesValue()
+    : CSSValueList(GridLineNamesClass, SpaceSeparator)
+{
+}
+
+PassRefPtr<CSSGridLineNamesValue> CSSGridLineNamesValue::cloneForCSSOM() const
+{
+    return adoptRef(new CSSGridLineNamesValue(*this));
+}
+
+}
+