Make Position::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 341 matching lines @@
     const PositionWithAffinityTemplate<Strategy>& c) {
   // TODO: this is the current behavior that might need to be fixed.
   // Please refer to https://bugs.webkit.org/show_bug.cgi?id=49107 for detail.
   PositionWithAffinityTemplate<Strategy> vis_pos =
       StartPositionForLine(c, kUseLogicalOrdering);
 
   if (ContainerNode* editable_root = HighestEditableRoot(c.GetPosition())) {
     if (!editable_root->contains(
             vis_pos.GetPosition().ComputeContainerNode())) {
       return PositionWithAffinityTemplate<Strategy>(
-          PositionTemplate<Strategy>::FirstPositionInNode(editable_root));
+          PositionTemplate<Strategy>::FirstPositionInNode(*editable_root));
     }
   }
 
   return HonorEditingBoundaryAtOrBefore(vis_pos, c.GetPosition());
 }
 
 VisiblePosition LogicalStartOfLine(const VisiblePosition& current_position) {
   DCHECK(current_position.IsValid()) << current_position;
   return CreateVisiblePosition(LogicalStartOfLineAlgorithm<EditingStrategy>(
       current_position.ToPositionWithAffinity()));
@@ skipping 374 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