Remove dead code from RenderLayer and inline filter methods.

sky/engine/core/rendering/RenderBox.cpp

Index: sky/engine/core/rendering/RenderBox.cpp
diff --git a/sky/engine/core/rendering/RenderBox.cpp b/sky/engine/core/rendering/RenderBox.cpp
index 4d4a814a9b0154c1612437f15f66275769d55bb5..c47ab38c41a4758002a0506656a1a094f1d3c0d7 100644
--- a/sky/engine/core/rendering/RenderBox.cpp
+++ b/sky/engine/core/rendering/RenderBox.cpp
@@ -845,7 +845,7 @@ void RenderBox::paintLayerContents(GraphicsContext* context, const LayerPainting
 
     layer()->clipToRect(localPaintingInfo, context, contentRect);
 
-    FilterEffectRendererHelper filterPainter(layer()->filterRenderer() && layer()->paintsWithFilters());
+    FilterEffectRendererHelper filterPainter(layer()->filterRenderer() && hasFilter());
 
     if (filterPainter.haveFilterEffect()) {
         ASSERT(layer()->filterInfo());