Remove needsShadowTreeWalker flag

Source/core/dom/shadow/ElementShadow.cpp

Index: Source/core/dom/shadow/ElementShadow.cpp
diff --git a/Source/core/dom/shadow/ElementShadow.cpp b/Source/core/dom/shadow/ElementShadow.cpp
index ec30bd6535872d8ca0034ea802178af075185b1e..b0e71f1ceff88ba0cf5728e1c65b361df6e86e26 100644
--- a/Source/core/dom/shadow/ElementShadow.cpp
+++ b/Source/core/dom/shadow/ElementShadow.cpp
@@ -41,12 +41,6 @@ ShadowRoot* ElementShadow::addShadowRoot(Element* shadowHost, ShadowRoot::Shadow
     m_distributor.didShadowBoundaryChange(shadowHost);
     ChildNodeInsertionNotifier(shadowHost).notify(shadowRoot.get());
 
-    // Existence of shadow roots requires the host and its children to do traversal using ComposedShadowTreeWalker.
-    shadowHost->setNeedsShadowTreeWalker();
-
-    // FIXME(94905): ShadowHost should be reattached during recalcStyle.
-    // Set some flag here and recreate shadow hosts' renderer in
-    // Element::recalcStyle.
     if (shadowHost->attached())
         shadowHost->lazyReattach();