Merge ReferenceFilter into Filter

Source/core/layout/svg/ReferenceFilterBuilder.h

Index: Source/core/layout/svg/ReferenceFilterBuilder.h
diff --git a/Source/core/layout/svg/ReferenceFilterBuilder.h b/Source/core/layout/svg/ReferenceFilterBuilder.h
index 16c02792927f36d25b5583c9e97eccf1079f97ad..72e8602e82425e7650a435c0cb9b834ad4995a89 100644
--- a/Source/core/layout/svg/ReferenceFilterBuilder.h
+++ b/Source/core/layout/svg/ReferenceFilterBuilder.h
@@ -39,10 +39,10 @@
 namespace blink {
 
 class Element;
+class Filter;
 class FilterEffect;
 class FilterOperation;
 class ReferenceFilterOperation;
-class ReferenceFilter;
 
 class ReferenceFilterBuilder {
     STATIC_ONLY(ReferenceFilterBuilder);
@@ -51,7 +51,7 @@ public:
     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;