Revert "Make compositingState explicit (re-land #2 with bogus ASSERT removed)"

Source/core/rendering/svg/SVGRenderingContext.cpp

Index: Source/core/rendering/svg/SVGRenderingContext.cpp
diff --git a/Source/core/rendering/svg/SVGRenderingContext.cpp b/Source/core/rendering/svg/SVGRenderingContext.cpp
index 2f79029eec24b5f88ec8d747d799f0068ee4d31e..5349b0e7fcc044da335caee7832b9747be4762cb 100644
--- a/Source/core/rendering/svg/SVGRenderingContext.cpp
+++ b/Source/core/rendering/svg/SVGRenderingContext.cpp
@@ -226,9 +226,7 @@ void SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(con
             absoluteTransform = layerTransform->toAffineTransform() * absoluteTransform;
 
         // We can stop at compositing layers, to match the backing resolution.
-        // FIXME: should we be computing the transform to the nearest composited layer,
-        // or the nearest composited layer that does not paint into its ancestor?
-        if (layer->compositedLayerMapping())
+        if (layer->isComposited())
             break;
 
         layer = layer->parent();