Merge ReferenceFilter into Filter

Source/core/layout/svg/ReferenceFilterBuilder.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
@@ skipping 21 matching lines @@
 #define ReferenceFilterBuilder_h
 
 #include "core/fetch/DocumentResourceReference.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class Element;
+class Filter;
 class FilterEffect;
 class FilterOperation;
 class ReferenceFilterOperation;
-class ReferenceFilter;
 
 class ReferenceFilterBuilder {
     STATIC_ONLY(ReferenceFilterBuilder);
 public:
     static DocumentResourceReference* documentResourceReference(const FilterOperation*);
     static void setDocumentResourceReference(const FilterOperation*, PassOwnPtr<DocumentResourceReference>);
     static void clearDocumentResourceReference(const FilterOperation*);
 
-    static PassRefPtrWillBeRawPtr<ReferenceFilter> build(float zoom, Element*, FilterEffect* previousEffect, const ReferenceFilterOperation&);
+    static PassRefPtrWillBeRawPtr<Filter> build(float zoom, Element*, FilterEffect* previousEffect, const ReferenceFilterOperation&);
 
 private:
     static HashMap<const FilterOperation*, OwnPtr<DocumentResourceReference>>* documentResourceReferences;
 };
 
 }
 
 #endif // ReferenceFilterBuilder_h