Use Length for the stroke-dashoffset property in SVGLayoutStyle

Source/core/layout/style/SVGLayoutStyleDefs.cpp

 /*
     Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
                   2004, 2005, 2007 Rob Buis <buis@kde.org>
     Copyright (C) Research In Motion Limited 2010. All rights reserved.
 
     Based on khtml code by:
     Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
     Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
     Copyright (C) 2002-2003 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Apple Computer, Inc.
@@ skipping 68 matching lines @@
     , visitedLinkPaintColor(SVGLayoutStyle::initialStrokePaintColor())
     , visitedLinkPaintUri(SVGLayoutStyle::initialStrokePaintUri())
 {
 }
 
 StyleStrokeData::StyleStrokeData(const StyleStrokeData& other)
     : RefCounted<StyleStrokeData>()
     , opacity(other.opacity)
     , miterLimit(other.miterLimit)
     , width(other.width->clone())
-    , dashOffset(other.dashOffset->clone())
+    , dashOffset(other.dashOffset)
     , dashArray(other.dashArray->clone())
     , paintType(other.paintType)
     , paintColor(other.paintColor)
     , paintUri(other.paintUri)
     , visitedLinkPaintType(other.visitedLinkPaintType)
     , visitedLinkPaintColor(other.visitedLinkPaintColor)
     , visitedLinkPaintUri(other.visitedLinkPaintUri)
 {
 }
 
 bool StyleStrokeData::operator==(const StyleStrokeData& other) const
 {
     return *width == *other.width
         && opacity == other.opacity
         && miterLimit == other.miterLimit
-        && *dashOffset == *other.dashOffset
+        && dashOffset == other.dashOffset
         && *dashArray == *other.dashArray
         && paintType == other.paintType
         && paintColor == other.paintColor
         && paintUri == other.paintUri
         && visitedLinkPaintType == other.visitedLinkPaintType
         && visitedLinkPaintColor == other.visitedLinkPaintColor
         && visitedLinkPaintUri == other.visitedLinkPaintUri;
 }
 
 StyleStopData::StyleStopData()
@@ skipping 108 matching lines @@
 
 bool StyleLayoutData::operator==(const StyleLayoutData& other) const
 {
     return x == other.x
         && y == other.y
         && rx == other.rx
         && ry == other.ry;
 }
 
 }