Use Length for the stroke-width property in SVGLayoutStyle

Source/core/layout/style/SVGLayoutStyleDefs.cpp

Index: Source/core/layout/style/SVGLayoutStyleDefs.cpp
diff --git a/Source/core/layout/style/SVGLayoutStyleDefs.cpp b/Source/core/layout/style/SVGLayoutStyleDefs.cpp
index 44b837e4dc46bfc15582e3dea34db3da9a9a238c..886507017cefdf972fcf86ba544d851437f43f36 100644
--- a/Source/core/layout/style/SVGLayoutStyleDefs.cpp
+++ b/Source/core/layout/style/SVGLayoutStyleDefs.cpp
@@ -85,7 +85,7 @@ StyleStrokeData::StyleStrokeData(const StyleStrokeData& other)
     : RefCounted<StyleStrokeData>()
     , opacity(other.opacity)
     , miterLimit(other.miterLimit)
-    , width(other.width->clone())
+    , width(other.width)
     , dashOffset(other.dashOffset)
     , dashArray(other.dashArray)
     , paintType(other.paintType)
@@ -99,7 +99,7 @@ StyleStrokeData::StyleStrokeData(const StyleStrokeData& other)
 
 bool StyleStrokeData::operator==(const StyleStrokeData& other) const
 {
-    return *width == *other.width
+    return width == other.width
         && opacity == other.opacity
         && miterLimit == other.miterLimit
         && dashOffset == other.dashOffset