Have positionInParentBeforeNode() / positionInParentAfterNode() take a reference

Source/core/editing/CreateLinkCommand.cpp

Index: Source/core/editing/CreateLinkCommand.cpp
diff --git a/Source/core/editing/CreateLinkCommand.cpp b/Source/core/editing/CreateLinkCommand.cpp
index 7f8adffff9fba2f232f09afc8f31344cc5815fa2..dcc5deb53007ba8ae83126fca79fe32cf64ab6ea 100644
--- a/Source/core/editing/CreateLinkCommand.cpp
+++ b/Source/core/editing/CreateLinkCommand.cpp
@@ -51,7 +51,7 @@ void CreateLinkCommand::doApply()
         insertNodeAt(anchorElement.get(), endingSelection().start());
         RefPtr<Text> textNode = Text::create(document(), m_url);
         appendNode(textNode.get(), anchorElement.get());
-        setEndingSelection(VisibleSelection(positionInParentBeforeNode(anchorElement.get()), positionInParentAfterNode(anchorElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
+        setEndingSelection(VisibleSelection(positionInParentBeforeNode(*anchorElement), positionInParentAfterNode(*anchorElement), DOWNSTREAM, endingSelection().isDirectional()));
     }
 }