Get rid of the one remaining extra call to LayerPainter::beginTransparencyLayers.

Source/core/rendering/compositing/CompositedLayerMapping.cpp

Index: Source/core/rendering/compositing/CompositedLayerMapping.cpp
diff --git a/Source/core/rendering/compositing/CompositedLayerMapping.cpp b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
index 40aa11be064e907c9f420e1377ae8c27e3a3cba1..c775d5b4951800fb70283cf8b6686de8226de197 100644
--- a/Source/core/rendering/compositing/CompositedLayerMapping.cpp
+++ b/Source/core/rendering/compositing/CompositedLayerMapping.cpp
@@ -2114,8 +2114,6 @@ void CompositedLayerMapping::doPaintTask(const GraphicsLayerPaintInfo& paintInfo
         context->restore();
     }
 
-    ASSERT(!paintInfo.renderLayer->usedTransparency());
-
     // Manually restore the context to its original state by applying the opposite translation.
     context->translate(offset.width(), offset.height());
 }