Pass a struct to ContainerNode::childrenChanged() instead of separate arguments

Source/core/html/HTMLElement.h

Index: Source/core/html/HTMLElement.h
diff --git a/Source/core/html/HTMLElement.h b/Source/core/html/HTMLElement.h
index 492555175a634650522c5f699d2c414e1fc17a3e..3315088763d4ccb63b60f34db2957693c1bcfdd9 100644
--- a/Source/core/html/HTMLElement.h
+++ b/Source/core/html/HTMLElement.h
@@ -107,7 +107,7 @@ protected:
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) OVERRIDE;
     unsigned parseBorderWidthAttribute(const AtomicString&) const;
 
-    virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0) OVERRIDE;
+    virtual void childrenChanged(const ChildrenChange&) OVERRIDE;
     void calculateAndAdjustDirectionality();
 
 private:
@@ -119,7 +119,7 @@ private:
 
     void dirAttributeChanged(const AtomicString&);
     void adjustDirectionalityIfNeededAfterChildAttributeChanged(Element* child);
-    void adjustDirectionalityIfNeededAfterChildrenChanged(Node* beforeChange, int childCountDelta);
+    void adjustDirectionalityIfNeededAfterChildrenChanged(const ChildrenChange&);
     TextDirection directionality(Node** strongDirectionalityTextNode= 0) const;
 
     TranslateAttributeMode translateAttributeMode() const;