Have positionInParentBeforeNode() / positionInParentAfterNode() take a reference

Source/core/editing/InsertLineBreakCommand.cpp

Index: Source/core/editing/InsertLineBreakCommand.cpp
diff --git a/Source/core/editing/InsertLineBreakCommand.cpp b/Source/core/editing/InsertLineBreakCommand.cpp
index 606e7cd5884385984784dbff299cdbcfeb52db2c..5270238d9484c1824f62e95d00a0d919b2ccc811 100644
--- a/Source/core/editing/InsertLineBreakCommand.cpp
+++ b/Source/core/editing/InsertLineBreakCommand.cpp
@@ -106,12 +106,12 @@ void InsertLineBreakCommand::doApply()
         if (!isStartOfParagraph(VisiblePosition(positionBeforeNode(nodeToInsert.get()))))
             insertNodeBefore(nodeToInsert->cloneNode(false).get(), nodeToInsert.get());
 
-        setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM, endingSelection().isDirectional()));
+        setEndingSelection(VisibleSelection(positionInParentAfterNode(*nodeToInsert), DOWNSTREAM, endingSelection().isDirectional()));
     // If we're inserting after all of the rendered text in a text node, or into a non-text node,
     // a simple insertion is sufficient.
     } else if (pos.deprecatedEditingOffset() >= caretMaxOffset(pos.deprecatedNode()) || !pos.deprecatedNode()->isTextNode()) {
         insertNodeAt(nodeToInsert.get(), pos);
-        setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM, endingSelection().isDirectional()));
+        setEndingSelection(VisibleSelection(positionInParentAfterNode(*nodeToInsert), DOWNSTREAM, endingSelection().isDirectional()));
     } else if (pos.deprecatedNode()->isTextNode()) {
         // Split a text node
         Text* textNode = toText(pos.deprecatedNode());
@@ -122,7 +122,7 @@ void InsertLineBreakCommand::doApply()
         // Handle whitespace that occurs after the split
         document().updateLayoutIgnorePendingStylesheets();
         if (!endingPosition.isRenderedCharacter()) {
-            Position positionBeforeTextNode(positionInParentBeforeNode(textNode));
+            Position positionBeforeTextNode(positionInParentBeforeNode(*textNode));
             // Clear out all whitespace and insert one non-breaking space
             deleteInsignificantTextDownstream(endingPosition);
             ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());