Changed Pair to be a CSSValue

Source/core/css/Pair.cpp

Index: Source/core/css/Pair.cpp
diff --git a/Source/core/css/Pair.cpp b/Source/core/css/Pair.cpp
deleted file mode 100644
index e329c4533195d3de8c65ef20b56f228296f0d65a..0000000000000000000000000000000000000000
--- a/Source/core/css/Pair.cpp
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "config.h"
-#include "core/css/Pair.h"
-
-namespace blink {
-
-DEFINE_TRACE(Pair)
-{
-    visitor->trace(m_first);
-    visitor->trace(m_second);
-}
-
-}