Reverting base class for CachedSVGDocumentReference to avoid platform layering violations

Source/WebCore/platform/graphics/filters/FilterOperation.h

Index: Source/WebCore/platform/graphics/filters/FilterOperation.h
diff --git a/Source/WebCore/platform/graphics/filters/FilterOperation.h b/Source/WebCore/platform/graphics/filters/FilterOperation.h
index 28a607a16ac656ad238361c8e8aae7d4981f0b00..e4292995d9157cf5e48d62504f3101eef82da053 100644
--- a/Source/WebCore/platform/graphics/filters/FilterOperation.h
+++ b/Source/WebCore/platform/graphics/filters/FilterOperation.h
@@ -37,10 +37,6 @@
 #include <wtf/RefCounted.h>
 #include <wtf/text/WTFString.h>
 
-#if ENABLE(SVG)
-#include "CachedSVGDocumentReference.h"
-#endif
-
 // Annoyingly, wingdi.h #defines this.
 #ifdef PASSTHROUGH
 #undef PASSTHROUGH
@@ -157,16 +153,19 @@ public:
         return adoptRef(new ReferenceFilterOperation(url, fragment, type));
     }
 
+    class Data {
+    public:
+        virtual ~Data() { }
+    };
+
     virtual bool affectsOpacity() const { return true; }
     virtual bool movesPixels() const { return true; }
 
     const String& url() const { return m_url; }
     const String& fragment() const { return m_fragment; }
 
-#if ENABLE(SVG)
-    CachedSVGDocumentReference* cachedSVGDocumentReference() const { return m_cachedSVGDocumentReference.get(); }
-    void setCachedSVGDocumentReference(PassOwnPtr<CachedSVGDocumentReference> cachedSVGDocumentReference) { m_cachedSVGDocumentReference = cachedSVGDocumentReference; }
-#endif
+    Data* data() const { return m_data.get(); }
+    void setData(PassOwnPtr<Data> data) { m_data = data; }
 
     FilterEffect* filterEffect() const { return m_filterEffect.get(); }
     void setFilterEffect(PassRefPtr<FilterEffect> filterEffect) { m_filterEffect = filterEffect; }
@@ -190,9 +189,7 @@ private:
 
     String m_url;
     String m_fragment;
-#if ENABLE(SVG)
-    OwnPtr<CachedSVGDocumentReference> m_cachedSVGDocumentReference;
-#endif
+    OwnPtr<Data> m_data;
     RefPtr<FilterEffect> m_filterEffect;
 };