Remove SourceGraphic reference from SkiaImageFilterBuilder

Source/core/paint/SVGFilterPainter.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/SVGFilterPainter.h"
 
 #include "core/layout/PaintInfo.h"
 #include "core/layout/svg/LayoutSVGResourceFilter.h"
 #include "core/paint/CompositingRecorder.h"
@@ skipping 50 matching lines @@
         filterData->m_displayItemList = nullptr;
         filterData->m_context = nullptr;
     }
 
     filterData->m_state = FilterData::ReadyToPaint;
 }
 
 static void paintFilteredContent(GraphicsContext* context, FilterData* filterData, SVGFilterElement* filterElement)
 {
     ASSERT(filterData->m_state == FilterData::ReadyToPaint);
+    ASSERT(filterData->builder->getEffectById(SourceGraphic::effectName()));
+
     filterData->m_state = FilterData::PaintingFilter;
 
     SkiaImageFilterBuilder builder(context);
-    SourceGraphic* sourceGraphic = static_cast<SourceGraphic*>(filterData->builder->getEffectById(SourceGraphic::effectName()));
-    ASSERT(sourceGraphic);
-    builder.setSourceGraphic(sourceGraphic);
     RefPtr<SkImageFilter> imageFilter = builder.build(filterData->builder->lastEffect(), ColorSpaceDeviceRGB);
     FloatRect boundaries = filterData->boundaries;
     context->save();
 
     // Clip drawing of filtered image to the minimum required paint rect.
     FilterEffect* lastEffect = filterData->builder->lastEffect();
     context->clipRect(lastEffect->determineAbsolutePaintRect(lastEffect->maxEffectRect()));
     if (filterElement->hasAttribute(SVGNames::filterResAttr)) {
         // Get boundaries in device coords.
         // FIXME: See crbug.com/382491. Is the use of getCTM OK here, given it does not include device
@@ skipping 103 matching lines @@
 
     LayoutObjectDrawingRecorder recorder(*context, object, DisplayItem::SVGFilter, LayoutRect::infiniteIntRect());
     if (recorder.canUseCachedDrawing())
         return;
 
     if (filterData && filterData->m_state == FilterData::ReadyToPaint)
         paintFilteredContent(context, filterData, toSVGFilterElement(m_filter.element()));
 }
 
 }