Remove PaintBehavior. It's unused.

sky/engine/core/rendering/LayerPaintingInfo.h

Index: sky/engine/core/rendering/LayerPaintingInfo.h
diff --git a/sky/engine/core/rendering/LayerPaintingInfo.h b/sky/engine/core/rendering/LayerPaintingInfo.h
index a77cb10c2273b26402a06b93089b1fcb149b7a31..542323a391cbeb61a0e7f9409c5b09d3a7e04ec3 100644
--- a/sky/engine/core/rendering/LayerPaintingInfo.h
+++ b/sky/engine/core/rendering/LayerPaintingInfo.h
@@ -61,20 +61,17 @@ typedef unsigned PaintLayerFlags;
 
 struct LayerPaintingInfo {
     LayerPaintingInfo(RenderLayer* inRootLayer, const LayoutRect& inDirtyRect,
-        PaintBehavior inPaintBehavior, const LayoutSize& inSubPixelAccumulation,
-        RenderObject* inPaintingRoot = 0)
+        const LayoutSize& inSubPixelAccumulation, RenderObject* inPaintingRoot = 0)
         : rootLayer(inRootLayer)
         , paintingRoot(inPaintingRoot)
         , paintDirtyRect(inDirtyRect)
         , subPixelAccumulation(inSubPixelAccumulation)
-        , paintBehavior(inPaintBehavior)
         , clipToDirtyRect(true)
     { }
     RenderLayer* rootLayer;
     RenderObject* paintingRoot; // only paint descendants of this object
     LayoutRect paintDirtyRect; // relative to rootLayer;
     LayoutSize subPixelAccumulation;
-    PaintBehavior paintBehavior;
     bool clipToDirtyRect;
 };