Unschedule the SVG filter layer update hack after detaching children

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 522ab743c97b6f2eb78449f1d6d0d4fda5f84398..2c68009aa43e0c74aca597bac82dc6e34c4cb84f 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1349,8 +1349,6 @@ void Element::detach(const AttachContext& context)
     HTMLFrameOwnerElement::UpdateSuspendScope suspendWidgetHierarchyUpdates;
     cancelFocusAppearanceUpdate();
     removeCallbackSelectors();
-    if (svgFilterNeedsLayerUpdate())
-        document().unscheduleSVGFilterLayerUpdateHack(*this);
     if (hasRareData()) {
         ElementRareData* data = elementRareData();
         data->clearPseudoElements();
@@ -1377,7 +1375,12 @@ void Element::detach(const AttachContext& context)
         if (ElementShadow* shadow = data->shadow())
             shadow->detach(context);
     }
+
     ContainerNode::detach(context);
+
+    ASSERT(needsAttach());
+    if (svgFilterNeedsLayerUpdate())
+        document().unscheduleSVGFilterLayerUpdateHack(*this);
 }
 
 bool Element::pseudoStyleCacheIsInvalid(const RenderStyle* currentStyle, RenderStyle* newStyle)