Move Image ownership out of CSSValue

Source/core/css/CSSCrossfadeValue.h

Index: Source/core/css/CSSCrossfadeValue.h
diff --git a/Source/core/css/CSSCrossfadeValue.h b/Source/core/css/CSSCrossfadeValue.h
index 926bae0d2ce1839908b08adbfed929f0fb3450f5..e07bc060be6d5ad6fac171745710eea0bb9ebc18 100644
--- a/Source/core/css/CSSCrossfadeValue.h
+++ b/Source/core/css/CSSCrossfadeValue.h
@@ -55,10 +55,10 @@ public:
     bool isFixedSize() const { return true; }
     IntSize fixedSize(const LayoutObject*);
 
-    bool isPending() const;
+    bool isPending(CSSStyleImageMap&) const;
     bool knownToBeOpaque(const LayoutObject*) const;
 
-    void loadSubimages(Document*);
+    void loadSubimages(Document*, CSSStyleImageMap&);
 
     void setPercentage(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> percentageValue) { m_percentageValue = percentageValue; }