Revert "Remove ShouldSetAttached flag to lazyAttach"

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 7a883fbbb0dc81a1e703bce489c5f29ead8bdea9..c9323b3dbb7fa6990d8fde759c80e59733f85c6b 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -775,16 +775,18 @@ void Node::setNeedsStyleRecalc(StyleChangeType changeType, StyleChangeSource sou
         markAncestorsWithChildNeedsStyleRecalc();
 }
 
-void Node::lazyAttach()
+void Node::lazyAttach(ShouldSetAttached shouldSetAttached)
 {
     markAncestorsWithChildNeedsStyleRecalc();
     for (Node* node = this; node; node = NodeTraversal::next(node, this)) {
         node->setStyleChange(LazyAttachStyleChange);
         if (node->isContainerNode())
             node->setChildNeedsStyleRecalc();
-        node->setAttached();
+        // FIXME: This flag is only used by HTMLFrameElementBase and doesn't look needed.
+        if (shouldSetAttached == SetAttached)
+            node->setAttached();
         for (ShadowRoot* root = node->youngestShadowRoot(); root; root = root->olderShadowRoot())
-            root->lazyAttach();
+            root->lazyAttach(shouldSetAttached);
     }
 }