[oilpan] Handlify childrenChanged.

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 1c5753752811c9d1934865c2b26b3d9b4a338c5a..3c7a845f330cb11798a720eaa9bf9f43b3f933bb 100644
--- a/Source/core/html/HTMLElement.h
+++ b/Source/core/html/HTMLElement.h
@@ -114,7 +114,7 @@ protected:
     virtual InsertionNotificationRequest insertedInto(const Handle<ContainerNode>&) OVERRIDE;
     virtual void removedFrom(const Handle<ContainerNode>&) OVERRIDE;
 
-    virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
+    virtual void childrenChanged(bool changedByParser = false, const Handle<Node>& beforeChange = nullptr, const Handle<Node>& afterChange = nullptr, int childCountDelta = 0);
     void calculateAndAdjustDirectionality();
 
 private:
@@ -129,7 +129,7 @@ private:
 
     void dirAttributeChanged(const AtomicString&);
     void adjustDirectionalityIfNeededAfterChildAttributeChanged(Element* child);
-    TextDirection directionality(Node** strongDirectionalityTextNode= 0) const;
+    TextDirection directionality(Handle<Node>* strongDirectionalityTextNode= 0) const;
 
     TranslateAttributeMode translateAttributeMode() const;