Remove CSS clients of ImageResource

sky/engine/core/animation/DeferredLegacyStyleInterpolation.cpp

Index: sky/engine/core/animation/DeferredLegacyStyleInterpolation.cpp
diff --git a/sky/engine/core/animation/DeferredLegacyStyleInterpolation.cpp b/sky/engine/core/animation/DeferredLegacyStyleInterpolation.cpp
index a2ef3e86ea0bf9afc13b522cb09511ce04ca79bf..0c00b6f5e99b216eb41deeffa8c8f6fa1f5894bf 100644
--- a/sky/engine/core/animation/DeferredLegacyStyleInterpolation.cpp
+++ b/sky/engine/core/animation/DeferredLegacyStyleInterpolation.cpp
@@ -5,7 +5,6 @@
 #include "sky/engine/core/animation/DeferredLegacyStyleInterpolation.h"
 
 #include "sky/engine/core/animation/LegacyStyleInterpolation.h"
-#include "sky/engine/core/css/CSSImageValue.h"
 #include "sky/engine/core/css/CSSPrimitiveValue.h"
 #include "sky/engine/core/css/CSSShadowValue.h"
 #include "sky/engine/core/css/CSSValueList.h"
@@ -36,8 +35,6 @@ bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const C
     case CSSValue::CSS_VALUE_LIST:
         return interpolationRequiresStyleResolve(toCSSValueList(value));
     case CSSValue::CSS_CUSTOM:
-        if (value.isImageValue())
-            return interpolationRequiresStyleResolve(toCSSImageValue(value));
         if (value.isShadowValue())
             return interpolationRequiresStyleResolve(toCSSShadowValue(value));
         // FIXME: consider other custom types.
@@ -97,11 +94,6 @@ bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const C
     return (primitiveValue.getValueID() != CSSValueNone);
 }
 
-bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSImageValue& imageValue)
-{
-    return false;
-}
-
 bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSShadowValue& shadowValue)
 {
     return (shadowValue.x && interpolationRequiresStyleResolve(*shadowValue.x))