Have positionInParentBeforeNode() / positionInParentAfterNode() take a reference

Source/core/dom/PositionIterator.cpp

Index: Source/core/dom/PositionIterator.cpp
diff --git a/Source/core/dom/PositionIterator.cpp b/Source/core/dom/PositionIterator.cpp
index 772bd76139f7f22a11374f99e22376f35be8307a..5913fc3a3866c80c9cec8202d4e97547d1b3fa0f 100644
--- a/Source/core/dom/PositionIterator.cpp
+++ b/Source/core/dom/PositionIterator.cpp
@@ -41,7 +41,7 @@ PositionIterator::operator Position() const
         // FIXME: This check is inadaquete because any ancestor could be ignored by editing
         if (editingIgnoresContent(m_nodeAfterPositionInAnchor->parentNode()))
             return positionBeforeNode(m_anchorNode);
-        return positionInParentBeforeNode(m_nodeAfterPositionInAnchor);
+        return positionInParentBeforeNode(*m_nodeAfterPositionInAnchor);
     }
     if (m_anchorNode->hasChildren())
         return lastPositionInOrAfterNode(m_anchorNode);