Revert of Remove clearing of pending invalidation sets. (patchset #2 id:20001 of https://codereview…

third_party/WebKit/Source/core/dom/Element.cpp

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 575b315200c86f5f591b7e574ae3f19c22bd5757..35a1d56049ba7abad9aa03485d2a24aeb7f57566 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -1548,8 +1548,6 @@ void Element::removedFrom(ContainerNode* insertionPoint)
         if (ElementAnimations* elementAnimations = data->elementAnimations())
             elementAnimations->cssAnimations().cancel();
     }
-
-    document().styleEngine().styleInvalidator().clearInvalidation(*this);
 }
 
 void Element::attach(const AttachContext& context)
@@ -1636,6 +1634,8 @@ void Element::detach(const AttachContext& context)
         document().userActionElements().didDetach(*this);
     }
 
+    document().styleEngine().styleInvalidator().clearInvalidation(*this);
+
     if (svgFilterNeedsLayerUpdate())
         document().unscheduleSVGFilterLayerUpdateHack(*this);