Extract the SVG Filter Reference implementation out of the FilterEffectRenderer into its own type

Source/core/rendering/svg/ReferenceFilterBuilder.h

Index: Source/core/rendering/svg/ReferenceFilterBuilder.h
diff --git a/Source/core/rendering/style/StyleCustomFilterProgram.cpp b/Source/core/rendering/svg/ReferenceFilterBuilder.h
similarity index 73%
copy from Source/core/rendering/style/StyleCustomFilterProgram.cpp
copy to Source/core/rendering/svg/ReferenceFilterBuilder.h
index 31c3d64d662ce7da9ff0582f323a1c6c79d0fe36..9cc113a3fff9ee1fe0326791184c0707c5f62ded 100644
--- a/Source/core/rendering/style/StyleCustomFilterProgram.cpp
+++ b/Source/core/rendering/svg/ReferenceFilterBuilder.h
@@ -1,5 +1,6 @@
 /*
  * 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
@@ -27,20 +28,24 @@
  * SUCH DAMAGE.
  */
 
-#include "config.h"
+#ifndef ReferenceFilterBuilder_h
+#define ReferenceFilterBuilder_h
 
-#include "core/rendering/style/StyleCustomFilterProgram.h"
-
-#include "core/rendering/style/StyleCustomFilterProgramCache.h"
+#include "core/platform/graphics/filters/FilterEffect.h"
+#include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
-StyleCustomFilterProgram::~StyleCustomFilterProgram()
-{
-    if (m_cache)
-        m_cache->remove(this);
-}
+class Filter;
+class FilterEffect;
+class ReferenceFilterOperation;
+class RenderObject;
 
-} // namespace WebCore
+class ReferenceFilterBuilder {
+public:
+    static PassRefPtr<FilterEffect> build(Filter*, RenderObject* renderer, FilterEffect* previousEffect, const ReferenceFilterOperation*);
+};
 
+}
 
+#endif // ReferenceFilterBuilder_h