Simplify RenderLayer's handling of filters.

sky/engine/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 841 matching lines @@
             transparencyClipBox(layer(), localPaintingInfo.rootLayer, localPaintingInfo.subPixelAccumulation));
         context->clip(clipRect);
         context->beginTransparencyLayer(opacity());
     }
 
     layer()->clipToRect(localPaintingInfo, context, contentRect);
 
     FilterEffectRendererHelper filterPainter(layer()->filterRenderer() && hasFilter());
 
     if (filterPainter.haveFilterEffect()) {
-        ASSERT(layer()->filterInfo());
-
         if (!rootRelativeBoundsComputed)
             rootRelativeBounds = layer()->physicalBoundingBoxIncludingReflectionAndStackingChildren(paintingInfo.rootLayer, offsetFromRoot);
 
         if (filterPainter.prepareFilterEffect(layer(), rootRelativeBounds, paintingInfo.paintDirtyRect))
             context = filterPainter.beginFilterEffect(context);
     }
 
     LayoutPoint layerLocation = toPoint(layerBounds.location() - location() + localPaintingInfo.subPixelAccumulation);
 
     Vector<RenderBox*> layers;
@@ skipping 2151 matching lines @@
 
 RenderBox::BoxDecorationData::BoxDecorationData(const RenderStyle& style)
 {
     backgroundColor = style.colorIncludingFallback(CSSPropertyBackgroundColor);
     hasBackground = backgroundColor.alpha() || style.hasBackgroundImage();
     ASSERT(hasBackground == style.hasBackground());
     hasBorder = style.hasBorder();
 }
 
 } // namespace blink