Remove SiblingRuleHelper

Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 979 matching lines @@
 
     ChildListMutationScope(*this).childAdded(child);
 
     childrenChanged(false, child.previousSibling(), child.nextSibling(), 1);
 
     ChildNodeInsertionNotifier(*this).notify(child);
 
     dispatchChildInsertionEvents(child);
 }
 
+void ContainerNode::checkForChildrenAdjacentRuleChanges()
+{
+    bool hasDirectAdjacentRules = childrenAffectedByDirectAdjacentRules();
+    bool hasIndirectAdjacentRules = childrenAffectedByIndirectAdjacentRules();
+
+    if (!hasDirectAdjacentRules && !hasIndirectAdjacentRules)
+        return;
+
+    unsigned forceCheckOfNextElementCount = 0;
+    bool forceCheckOfAnyElementSibling = false;
+    Document& document = this->document();
+
+    for (Node* child = firstChild(); child; child = child->nextSibling()) {
+        if (!child->isElementNode())
+            continue;
+        Element* element = toElement(child);
+        bool childRulesChanged = element->needsStyleRecalc() && element->styleChangeType() >= SubtreeStyleChange;
+
+        if (forceCheckOfNextElementCount || forceCheckOfAnyElementSibling)
+            element->setNeedsStyleRecalc(SubtreeStyleChange);
+
+        if (forceCheckOfNextElementCount)
+            forceCheckOfNextElementCount--;
+
+        if (childRulesChanged && hasDirectAdjacentRules)
+            forceCheckOfNextElementCount = document.styleEngine()->maxDirectAdjacentSelectors();
+
+        forceCheckOfAnyElementSibling = forceCheckOfAnyElementSibling || (childRulesChanged && hasIndirectAdjacentRules);
+    }
+}
+
 PassRefPtr<HTMLCollection> ContainerNode::getElementsByTagName(const AtomicString& localName)
 {
     if (localName.isNull())
         return nullptr;
 
     if (document().isHTMLDocument())
         return ensureRareData().ensureNodeLists().addCache<HTMLTagCollection>(*this, HTMLTagCollectionType, localName);
     return ensureRareData().ensureNodeLists().addCache<TagCollection>(*this, TagCollectionType, localName);
 }
 
@@ skipping 39 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore