Backed out 1 changesets (bug 1473637) for frequent wpt failures inputevent-constructor.htm/window-named-properties-002.html CLOSED TREE

Backed out changeset 5342b206e024 (bug 1473637)

dom/base/FragmentOrElement.cpp

@@ -763,12 +763,10 @@ FragmentOrElement::nsExtendedDOMSlots::UnlinkExtendedSlots()
 
   // Don't clear mXBLBinding, it'll be done in
   // BindingManager::RemovedFromDocument from FragmentOrElement::Unlink.
-  //
-  // mShadowRoot will similarly be cleared explicitly from
-  // FragmentOrElement::Unlink.
   mSMILOverrideStyle = nullptr;
   mControllers = nullptr;
   mLabelsList = nullptr;
+  mShadowRoot = nullptr;
   if (mCustomElementData) {
     mCustomElementData->Unlink();
     mCustomElementData = nullptr;
@@ -1502,17 +1500,6 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(FragmentOrElement)
   // containing shadow root pointer.
   tmp->UnsetFlags(NODE_IS_IN_SHADOW_TREE);
 
-  if (ShadowRoot* shadowRoot = tmp->GetShadowRoot()) {
-    for (nsIContent* child = shadowRoot->GetFirstChild();
-         child;
-         child = child->GetNextSibling()) {
-      child->UnbindFromTree(true, false);
-    }
-
-    shadowRoot->SetIsComposedDocParticipant(false);
-    tmp->ExtendedDOMSlots()->mShadowRoot = nullptr;
-  }
-
   nsIDocument* doc = tmp->OwnerDoc();
   doc->BindingManager()->RemovedFromDocument(tmp, doc,
                                              nsBindingManager::eDoNotRunDtor);