Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/platform/graphics/filters/FELighting.cpp

 /*
  * Copyright (C) 2010 University of Szeged
  * Copyright (C) 2010 Zoltan Herczeg
  * 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
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 405 matching lines @@
     // Anyway, feConvolveMatrix should also use the implementation
 
     IntSize absolutePaintSize = absolutePaintRect().size();
     drawLighting(srcPixelArray, absolutePaintSize.width(), absolutePaintSize.height());
 }
 
 PassRefPtr<SkImageFilter> FELighting::createImageFilter(SkiaImageFilterBuilder* builder)
 {
     SkImageFilter::CropRect rect = getCropRect(builder ? builder->cropOffset() : FloatSize());
     Color lightColor = adaptColorToOperatingColorSpace(m_lightingColor);
-    RefPtr<SkImageFilter> input(builder ? builder->build(inputEffect(0), operatingColorSpace()) : 0);
+    RefPtr<SkImageFilter> input(builder ? builder->build(inputEffect(0), operatingColorSpace()) : nullptr);
     switch (m_lightSource->type()) {
     case LS_DISTANT: {
         DistantLightSource* distantLightSource = static_cast<DistantLightSource*>(m_lightSource.get());
         float azimuthRad = deg2rad(distantLightSource->azimuth());
         float elevationRad = deg2rad(distantLightSource->elevation());
         SkPoint3 direction(cosf(azimuthRad) * cosf(elevationRad),
                            sinf(azimuthRad) * cosf(elevationRad),
                            sinf(elevationRad));
         if (m_specularConstant > 0)
             return adoptRef(SkLightingImageFilter::CreateDistantLitSpecular(direction, lightColor.rgb(), m_surfaceScale, m_specularConstant, m_specularExponent, input.get(), &rect));
@@ skipping 14 matching lines @@
         float specularExponent = spotLightSource->specularExponent();
         float limitingConeAngle = spotLightSource->limitingConeAngle();
         if (!limitingConeAngle || limitingConeAngle > 90 || limitingConeAngle < -90)
             limitingConeAngle = 90;
         if (m_specularConstant > 0)
             return adoptRef(SkLightingImageFilter::CreateSpotLitSpecular(location, target, specularExponent, limitingConeAngle, lightColor.rgb(), m_surfaceScale, m_specularConstant, m_specularExponent, input.get(), &rect));
         return adoptRef(SkLightingImageFilter::CreateSpotLitDiffuse(location, target, specularExponent, limitingConeAngle, lightColor.rgb(), m_surfaceScale, m_diffuseConstant, input.get(), &rect));
     }
     default:
         ASSERT_NOT_REACHED();
-        return 0;
+        return nullptr;
     }
 }
 
 bool FELighting::applySkia()
 {
     // For now, only use the skia implementation for accelerated rendering.
     if (!filter()->isAccelerated())
         return false;
 
     ImageBuffer* resultImage = createImageBufferResult();
@@ skipping 14 matching lines @@
     GraphicsContext* dstContext = resultImage->context();
 
     SkPaint paint;
     RefPtr<SkImageFilter> filter = createImageFilter(0);
     paint.setImageFilter(filter.get());
     dstContext->drawBitmap(nativeImage->bitmap(), drawingRegion.location().x(), drawingRegion.location().y(), &paint);
     return true;
 }
 
 } // namespace WebCore