Remove some unused methods from Node and ContainerNode.

sky/engine/core/dom/ContainerNode.h

Index: sky/engine/core/dom/ContainerNode.h
diff --git a/sky/engine/core/dom/ContainerNode.h b/sky/engine/core/dom/ContainerNode.h
index 73a2afea2bc7936427169b28515b2bb1596ee4c7..e14510fa94511cdf4db96755ce635c480b07d036 100644
--- a/sky/engine/core/dom/ContainerNode.h
+++ b/sky/engine/core/dom/ContainerNode.h
@@ -214,18 +214,6 @@ inline Node* Node::lastChild() const
     return toContainerNode(this)->lastChild();
 }
 
-inline ContainerNode* Node::parentElementOrShadowRoot() const
-{
-    ContainerNode* parent = parentNode();
-    return parent && (parent->isElementNode() || parent->isShadowRoot()) ? parent : 0;
-}
-
-inline ContainerNode* Node::parentElementOrDocumentFragment() const
-{
-    ContainerNode* parent = parentNode();
-    return parent && (parent->isElementNode() || parent->isDocumentFragment()) ? parent : 0;
-}
-
 inline bool Node::isTreeScope() const
 {
     return &treeScope().rootNode() == this;