Use Length for the stroke-width property in SVGLayoutStyle

Source/core/animation/SVGLengthStyleInterpolation.h

Index: Source/core/animation/SVGLengthStyleInterpolation.h
diff --git a/Source/core/animation/SVGLengthStyleInterpolation.h b/Source/core/animation/SVGLengthStyleInterpolation.h
deleted file mode 100644
index 16a6c12ac3336a6c51a437d5d55ac7f870921aee..0000000000000000000000000000000000000000
--- a/Source/core/animation/SVGLengthStyleInterpolation.h
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef SVGLengthStyleInterpolation_h
-#define SVGLengthStyleInterpolation_h
-
-#include "core/animation/StyleInterpolation.h"
-#include "core/css/CSSPrimitiveValue.h"
-#include "platform/Length.h"
-
-namespace blink {
-
-class SVGLengthStyleInterpolation : public StyleInterpolation {
-public:
-    static PassRefPtrWillBeRawPtr<SVGLengthStyleInterpolation> maybeCreate(const CSSValue& start, const CSSValue& end, CSSPropertyID, InterpolationRange);
-
-    virtual void apply(StyleResolverState&) const override;
-
-    DEFINE_INLINE_VIRTUAL_TRACE()
-    {
-        StyleInterpolation::trace(visitor);
-    }
-
-private:
-    SVGLengthStyleInterpolation(const CSSPrimitiveValue& start, const CSSPrimitiveValue& end, CSSPropertyID, CSSPrimitiveValue::UnitType, InterpolationRange);
-
-    static bool canCreateFrom(const CSSValue&);
-    static CSSPrimitiveValue::UnitType commonUnitType(const CSSPrimitiveValue& start, const CSSPrimitiveValue& end);
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> lengthToInterpolableValue(const CSSPrimitiveValue&);
-    static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> interpolableValueToLength(const InterpolableValue&, CSSPrimitiveValue::UnitType, InterpolationRange);
-
-    CSSPrimitiveValue::UnitType m_type;
-    InterpolationRange m_range;
-
-    friend class AnimationSVGLengthStyleInterpolationTest;
-    friend class SVGStrokeDasharrayStyleInterpolation;
-};
-
-}
-
-#endif // SVGLengthStyleInterpolation_h