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

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

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 430 matching lines @@
                                        ? GetDocument().FocusedElement()
                                        : GetDocument().documentElement();
   if (!focused_element)
     return false;
 
   if (focused_element->IsTextControl())
     return focused_element->ContainsIncludingHostElements(*current);
 
   // Selection has focus if it contains the focused element.
   const PositionInFlatTree& focused_position =
-      PositionInFlatTree::FirstPositionInNode(focused_element);
+      PositionInFlatTree::FirstPositionInNode(*focused_element);
   if (ComputeVisibleSelectionInFlatTree().Start() <= focused_position &&
       ComputeVisibleSelectionInFlatTree().End() >= focused_position)
     return true;
 
   bool has_editable_style = HasEditableStyle(*current);
   do {
     // If the selection is within an editable sub tree and that sub tree
     // doesn't have focus, the selection doesn't have focus either.
     if (has_editable_style && !HasEditableStyle(*current))
       return false;
@@ skipping 720 matching lines @@
 }
 
 void showTree(const blink::FrameSelection* sel) {
   if (sel)
     sel->ShowTreeForThis();
   else
     LOG(INFO) << "Cannot showTree for <null> FrameSelection.";
 }
 
 #endif