Move Image ownership out of CSSValue

Source/core/css/CSSGradientValue.h

Index: Source/core/css/CSSGradientValue.h
diff --git a/Source/core/css/CSSGradientValue.h b/Source/core/css/CSSGradientValue.h
index 92da1dda4dfa2e666117a017a7e4628ad6eabf8f..a8f46940c02e77fcaa57b996db69c513b3a667ed 100644
--- a/Source/core/css/CSSGradientValue.h
+++ b/Source/core/css/CSSGradientValue.h
@@ -28,6 +28,7 @@
 
 #include "core/css/CSSImageGeneratorValue.h"
 #include "core/css/CSSPrimitiveValue.h"
+#include "core/style/StyleImage.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
@@ -103,10 +104,10 @@ public:
     bool isFixedSize() const { return false; }
     IntSize fixedSize(const LayoutObject*) const { return IntSize(); }
 
-    bool isPending() const { return false; }
+    bool isPending(CSSStyleImageMap&) const { return false; }
     bool knownToBeOpaque(const LayoutObject*) const;
 
-    void loadSubimages(Document*) { }
+    void loadSubimages(Document*, CSSStyleImageMap&) { }
 
     DECLARE_TRACE_AFTER_DISPATCH();