Don't coerce pointers to compositor layer mappings to booleans.

Source/core/rendering/RenderLayerModelObject.cpp

Index: Source/core/rendering/RenderLayerModelObject.cpp
diff --git a/Source/core/rendering/RenderLayerModelObject.cpp b/Source/core/rendering/RenderLayerModelObject.cpp
index bf7c49df3f4f12ca3116a372624556c2c093459c..c89225cfdc4a0fbfd0228f9ad84db66e2e47be7d 100644
--- a/Source/core/rendering/RenderLayerModelObject.cpp
+++ b/Source/core/rendering/RenderLayerModelObject.cpp
@@ -202,10 +202,15 @@ void RenderLayerModelObject::addLayerHitTestRects(LayerHitTestRects& rects, cons
     }
 }
 
-CompositedLayerMapping* RenderLayerModelObject::compositedLayerMapping() const
+CompositedLayerMappingPtr RenderLayerModelObject::compositedLayerMapping() const
 {
     return m_layer ? m_layer->compositedLayerMapping() : 0;
 }
 
+bool RenderLayerModelObject::hasCompositedLayerMapping() const
+{
+    return m_layer ? m_layer->hasCompositedLayerMapping() : false;
+}
+
 } // namespace WebCore