Remove CSS clients of ImageResource

sky/engine/core/animation/DeferredLegacyStyleInterpolation.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 SKY_ENGINE_CORE_ANIMATION_DEFERREDLEGACYSTYLEINTERPOLATION_H_
 #define SKY_ENGINE_CORE_ANIMATION_DEFERREDLEGACYSTYLEINTERPOLATION_H_
 
 #include "sky/engine/core/animation/StyleInterpolation.h"
 #include "sky/engine/core/css/CSSValue.h"
 
 namespace blink {
 
 class CSSBasicShape;
-class CSSImageValue;
 class CSSPrimitiveValue;
 class CSSShadowValue;
 class CSSValueList;
 
 class DeferredLegacyStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtr<DeferredLegacyStyleInterpolation> create(PassRefPtr<CSSValue> start, PassRefPtr<CSSValue> end, CSSPropertyID id)
     {
         return adoptRef(new DeferredLegacyStyleInterpolation(start, end, id));
     }
 
     virtual void apply(StyleResolverState&) const override;
 
     static bool interpolationRequiresStyleResolve(const CSSValue&);
     static bool interpolationRequiresStyleResolve(const CSSPrimitiveValue&);
-    static bool interpolationRequiresStyleResolve(const CSSImageValue&);
     static bool interpolationRequiresStyleResolve(const CSSShadowValue&);
     static bool interpolationRequiresStyleResolve(const CSSValueList&);
     static bool interpolationRequiresStyleResolve(const CSSBasicShape&);
 
 private:
     DeferredLegacyStyleInterpolation(PassRefPtr<CSSValue> start, PassRefPtr<CSSValue> end, CSSPropertyID id)
         : StyleInterpolation(InterpolableNumber::create(0), InterpolableNumber::create(1), id)
         , m_startCSSValue(start)
         , m_endCSSValue(end)
     {
     }
 
     RefPtr<CSSValue> m_startCSSValue;
     RefPtr<CSSValue> m_endCSSValue;
 };
 
 }
 
 #endif  // SKY_ENGINE_CORE_ANIMATION_DEFERREDLEGACYSTYLEINTERPOLATION_H_