Clear the groupedMapping parameter in layers when removed from the group

Source/core/paint/DeprecatedPaintLayer.cpp

Index: Source/core/paint/DeprecatedPaintLayer.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayer.cpp b/Source/core/paint/DeprecatedPaintLayer.cpp
index 30e08b8b8cb0e32aa140fdf3cd0c608f1cc51040..03f00a73fb9d380d8b05cdd9e8aca456ded9c5e8 100644
--- a/Source/core/paint/DeprecatedPaintLayer.cpp
+++ b/Source/core/paint/DeprecatedPaintLayer.cpp
@@ -161,7 +161,7 @@ DeprecatedPaintLayer::~DeprecatedPaintLayer()
     if (groupedMapping()) {
         DisableCompositingQueryAsserts disabler;
         groupedMapping()->removeLayerFromSquashingGraphicsLayer(this);
-        setGroupedMapping(0);
+        setGroupedMapping(0, true);
     }
 
     // Child layers will be deleted by their corresponding layout objects, so
@@ -2352,17 +2352,17 @@ void DeprecatedPaintLayer::clearCompositedDeprecatedPaintLayerMapping(bool layer
         updateOrRemoveFilterEffectBuilder();
 }
 
-void DeprecatedPaintLayer::setGroupedMapping(CompositedDeprecatedPaintLayerMapping* groupedMapping, bool layerBeingDestroyed)
+void DeprecatedPaintLayer::setGroupedMapping(CompositedDeprecatedPaintLayerMapping* groupedMapping, bool issueInvalidations)
 {
     if (groupedMapping == m_groupedMapping)
         return;
 
-    if (!layerBeingDestroyed && m_groupedMapping) {
+    if (issueInvalidations && m_groupedMapping) {
         m_groupedMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
         m_groupedMapping->removeLayerFromSquashingGraphicsLayer(this);
     }
     m_groupedMapping = groupedMapping;
-    if (!layerBeingDestroyed && m_groupedMapping)
+    if (issueInvalidations && m_groupedMapping)
         m_groupedMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
 }