Remove the HasOwnBackingButPaintsIntoAncestor compositing state.

Source/core/rendering/compositing/GraphicsLayerUpdater.cpp

Index: Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
diff --git a/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp b/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
index aa37e4a191595623d2ad17ae84c10d35bb65243b..709fe4a72261e44aa66b59ea12edc75fbffd9cd6 100644
--- a/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
+++ b/Source/core/rendering/compositing/GraphicsLayerUpdater.cpp
@@ -97,12 +97,6 @@ void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer, UpdateType update
             const RenderLayer* compositingContainer = context.compositingContainer(layer);
             ASSERT(compositingContainer == layer.enclosingLayerWithCompositedLayerMapping(ExcludeSelf));
 
-            if (mapping->updateRequiresOwnBackingStoreForAncestorReasons(compositingContainer)) {
-                TRACE_LAYER_INVALIDATION(&layer, InspectorLayerInvalidationTrackingEvent::AncestorRequiresNewLayer);
-                layersNeedingPaintInvalidation.append(&layer);
-                updateType = ForceUpdate;
-            }
-
             if (mapping->updateGraphicsLayerConfiguration())
                 m_needsRebuildTree = true;