Make VisiblePosition::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 413 matching lines @@
     RemoveNode(node_after_downstream_start, editing_state);
     return true;
   }
 
   // FIXME: This code doesn't belong in here.
   // We detect the case where the start is an empty line consisting of BR not
   // wrapped in a block element.
   if (upstream_start_is_br && downstream_start_is_br) {
     GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
     if (!(IsStartOfBlock(
-              VisiblePosition::BeforeNode(node_after_upstream_start)) &&
+              VisiblePosition::BeforeNode(*node_after_upstream_start)) &&
           IsEndOfBlock(
               VisiblePosition::AfterNode(*node_after_upstream_start)))) {
       starts_at_empty_line_ = true;
       ending_position_ = downstream_end_;
     }
   }
 
   return false;
 }
 
@@ skipping 802 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