Make Position::BeforeNode() to take const Node& instead of Node*

third_party/WebKit/Source/core/editing/commands/InsertLineBreakCommand.cpp

 /*
  * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 109 matching lines @@
       } else {
         extra_node = node_to_insert->cloneNode(false);
         InsertNodeAfter(extra_node, node_to_insert, editing_state);
       }
       if (editing_state->IsAborted())
         return;
       node_to_insert = extra_node;
     }
 
     SetEndingSelection(SelectionInDOMTree::Builder()
-                           .Collapse(Position::BeforeNode(node_to_insert))
+                           .Collapse(Position::BeforeNode(*node_to_insert))
                            .SetIsDirectional(EndingSelection().IsDirectional())
                            .Build());
   } else if (pos.ComputeEditingOffset() <= CaretMinOffset(pos.AnchorNode())) {
     InsertNodeAt(node_to_insert, pos, editing_state);
     if (editing_state->IsAborted())
       return;
     GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
 
     // Insert an extra br or '\n' if the just inserted one collapsed.
     if (!IsStartOfParagraph(VisiblePosition::BeforeNode(node_to_insert))) {
@@ skipping 85 matching lines @@
     // block.
     SetEndingSelection(SelectionInDOMTree::Builder()
                            .Collapse(EndingSelection().End())
                            .Build());
   }
 
   RebalanceWhitespace();
 }
 
 }  // namespace blink