Make VisiblePosition::FirstPositionInNode() to take const Node& instead of Node*

third_party/WebKit/Source/core/editing/VisibleUnitsLine.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple 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
@@ skipping 668 matching lines @@
   }
 
   // Could not find a previous line. This means we must already be on the first
   // line. Move to the start of the content in this block, which effectively
   // moves us to the start of the line we're on.
   Element* root_element = HasEditableStyle(*node, editable_type)
                               ? RootEditableElement(*node, editable_type)
                               : node->GetDocument().documentElement();
   if (!root_element)
     return VisiblePosition();
-  return VisiblePosition::FirstPositionInNode(root_element);
+  return VisiblePosition::FirstPositionInNode(*root_element);
 }
 
 VisiblePosition NextLinePosition(const VisiblePosition& visible_position,
                                  LayoutUnit line_direction_point,
                                  EditableType editable_type) {
   DCHECK(visible_position.IsValid()) << visible_position;
 
   Position p = visible_position.DeepEquivalent();
   Node* node = p.AnchorNode();
 
@@ skipping 47 matching lines @@
   // to the end of the line we're on.
   Element* root_element = HasEditableStyle(*node, editable_type)
                               ? RootEditableElement(*node, editable_type)
                               : node->GetDocument().documentElement();
   if (!root_element)
     return VisiblePosition();
   return VisiblePosition::LastPositionInNode(root_element);
 }
 
 }  // namespace blink