Web Animations: Split image slice interpolation out of LengthBoxStyleInterpolation

Source/core/animation/LengthBoxStyleInterpolation.h

 // 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.
 
 #ifndef LengthBoxStyleInterpolation_h
 #define LengthBoxStyleInterpolation_h
 
 #include "core/animation/LengthStyleInterpolation.h"
 #include "core/css/CSSBorderImageSliceValue.h"
 #include "core/css/Rect.h"
 
 namespace blink {
 
 class LengthBoxStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtrWillBeRawPtr<LengthBoxStyleInterpolation> maybeCreateFrom(CSSValue&, CSSValue&, CSSPropertyID);
 
     static bool usesDefaultInterpolation(const CSSValue&, const CSSValue&);
 
     virtual void apply(StyleResolverState&) const override;
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    LengthBoxStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> startInterpolation, PassOwnPtrWillBeRawPtr<InterpolableValue> endInterpolation, CSSPropertyID id, bool fill, CSSValue* startCSS, CSSValue* endCSS)
+    LengthBoxStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> startInterpolation, PassOwnPtrWillBeRawPtr<InterpolableValue> endInterpolation, CSSPropertyID id, CSSValue* startCSS, CSSValue* endCSS)
         : StyleInterpolation(startInterpolation, endInterpolation, id)
-        , m_fill(fill)
         , m_startCSSValue(startCSS)
         , m_endCSSValue(endCSS)
     { }
 
     static PassOwnPtrWillBeRawPtr<InterpolableValue> lengthBoxtoInterpolableValue(const CSSValue&, const CSSValue&, bool);
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> borderImageSlicetoInterpolableValue(const CSSValue&);
     static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToLengthBox(InterpolableValue*, const CSSValue&, const CSSValue&);
-    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToBorderImageSlice(InterpolableValue*, bool);
 
-    bool m_fill;
     RefPtrWillBeMember<CSSValue> m_startCSSValue;
     RefPtrWillBeMember<CSSValue> m_endCSSValue;
 
     friend class AnimationLengthBoxStyleInterpolationTest;
 };
 
 } // namespace blink
 
 #endif // LengthBoxStyleInterpolation_h