Merge ReferenceFilter into Filter

Source/platform/graphics/filters/SkiaImageFilterBuilder.cpp

 /*
  * Copyright (C) 2012 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 disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 63 matching lines @@
 void SkiaImageFilterBuilder::buildFilterOperations(const FilterOperations& operations, WebFilterOperations* filters)
 {
     ColorSpace currentColorSpace = ColorSpaceDeviceRGB;
     SkImageFilter* const nullFilter = 0;
 
     for (size_t i = 0; i < operations.size(); ++i) {
         const FilterOperation& op = *operations.at(i);
         switch (op.type()) {
         case FilterOperation::REFERENCE: {
             RefPtr<SkImageFilter> filter;
-            ReferenceFilter* referenceFilter = toReferenceFilterOperation(op).filter();
+            Filter* referenceFilter = toReferenceFilterOperation(op).filter();
             if (referenceFilter && referenceFilter->lastEffect()) {
                 FilterEffect* filterEffect = referenceFilter->lastEffect();
                 // Prepopulate SourceGraphic with two image filters: one with a null image
                 // filter, and the other with a colorspace conversion filter.
                 // We don't know what color space the interior nodes will request, so we have to
                 // initialize SourceGraphic with both options.
                 // Since we know SourceGraphic is always PM-valid, we also use
                 // these for the PM-validated options.
                 RefPtr<SkImageFilter> deviceFilter = transformColorSpace(nullFilter, currentColorSpace, ColorSpaceDeviceRGB);
                 RefPtr<SkImageFilter> linearFilter = transformColorSpace(nullFilter, currentColorSpace, ColorSpaceLinearRGB);
@@ skipping 76 matching lines @@
         filters->appendReferenceFilter(filter.get());
     }
 }
 
 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::buildTransform(const AffineTransform& transform, SkImageFilter* input)
 {
     return adoptRef(SkImageFilter::CreateMatrixFilter(affineTransformToSkMatrix(transform), kHigh_SkFilterQuality, input));
 }
 
 } // namespace blink