Use Length for baselineShiftValue in SVGLayoutStyle

Source/core/layout/style/SVGLayoutStyleTest.cpp

 // 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/layout/style/SVGLayoutStyle.h"
 
 #include "core/layout/ClipPathOperation.h"
 #include "core/layout/style/ShapeValue.h"
 
@@ skipping 49 matching lines @@
         svg2->setStrokePaint(SVGLayoutStyle::initialStrokePaintType(), SVGLayoutStyle::initialStrokePaintColor(), SVGLayoutStyle::initialStrokePaintUri(), false, true);
         EXPECT_FALSE(svg1->diff(svg2.get()).hasDifference());
     }
 }
 
 TEST(SVGLayoutStyleTest, MiscStyleShouldCompareValue)
 {
     TEST_STYLE_VALUE_NO_DIFF(Color, FloodColor);
     TEST_STYLE_VALUE_NO_DIFF(float, FloodOpacity);
     TEST_STYLE_VALUE_NO_DIFF(Color, LightingColor);
-    TEST_STYLE_REFPTR_VALUE_NO_DIFF(SVGLength, BaselineShiftValue);
+    TEST_STYLE_VALUE_NO_DIFF(Length, BaselineShiftValue);
 }
 
 }