Update Source/platform/ to assume Oilpan only.

third_party/WebKit/Source/platform/graphics/filters/PaintFilterEffect.h

 // Copyright 2016 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.
 
 #ifndef PaintFilterEffect_h
 #define PaintFilterEffect_h
 
 #include "platform/graphics/filters/FilterEffect.h"
 #include "third_party/skia/include/core/SkPaint.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT PaintFilterEffect : public FilterEffect {
 public:
-    static RawPtr<PaintFilterEffect> create(Filter*, const SkPaint&);
+    static PaintFilterEffect* create(Filter*, const SkPaint&);
     ~PaintFilterEffect() override;
 
     FilterEffectType getFilterEffectType() const override { return FilterEffectTypeSourceInput; }
 
     TextStream& externalRepresentation(TextStream&, int indention) const override;
     PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder&) override;
 
 private:
     PaintFilterEffect(Filter*, const SkPaint&);
 
     SkPaint m_paint;
 };
 
 } // namespace blink
 
 #endif // PaintFilterEffect_h