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

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

 /*
  * Copyright (C) 2005 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 @@
   HTMLElement* start_special_container = nullptr;
   HTMLElement* end_special_container = nullptr;
 
   start = selection_to_delete_.Start();
   end = selection_to_delete_.End();
 
   // For HRs, we'll get a position at (HR,1) when hitting delete from the
   // beginning of the previous line, or (HR,0) when forward deleting, but in
   // these cases, we want to delete it, so manually expand the selection
   if (isHTMLHRElement(*start.AnchorNode()))
-    start = Position::BeforeNode(start.AnchorNode());
+    start = Position::BeforeNode(*start.AnchorNode());
   else if (isHTMLHRElement(*end.AnchorNode()))
     end = Position::AfterNode(end.AnchorNode());
 
   // FIXME: This is only used so that moveParagraphs can avoid the bugs in
   // special element expansion.
   if (!expand_for_special_elements_)
     return;
 
   while (1) {
     start_special_container = 0;
@@ skipping 1106 matching lines @@
   visitor->Trace(delete_into_blockquote_style_);
   visitor->Trace(start_root_);
   visitor->Trace(end_root_);
   visitor->Trace(start_table_row_);
   visitor->Trace(end_table_row_);
   visitor->Trace(temporary_placeholder_);
   CompositeEditCommand::Trace(visitor);
 }
 
 }  // namespace blink