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

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

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 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 1486 matching lines @@
     InsertNodeAt(HTMLBRElement::Create(GetDocument()),
                  before_paragraph.DeepEquivalent(), editing_state);
     if (editing_state->IsAborted())
       return;
   }
 
   // TextIterator::rangeLength requires clean layout.
   GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
 
   destination_index = TextIterator::RangeLength(
-      Position::FirstPositionInNode(GetDocument().documentElement()),
+      Position::FirstPositionInNode(*GetDocument().documentElement()),
       destination.ToParentAnchoredPosition(),
       TextIteratorBehavior::AllVisiblePositionsRangeLengthBehavior());
 
   const SelectionInDOMTree& destination_selection =
       SelectionInDOMTree::Builder()
           .Collapse(destination.ToPositionWithAffinity())
           .SetIsDirectional(original_is_directional)
           .Build();
   if (EndingSelection().IsNone()) {
     // We abort executing command since |destination| becomes invisible.
@@ skipping 153 matching lines @@
         editing_state);
     if (editing_state->IsAborted())
       return false;
   }
 
   AppendBlockPlaceholder(new_block, editing_state);
   if (editing_state->IsAborted())
     return false;
 
   SetEndingSelection(SelectionInDOMTree::Builder()
-                         .Collapse(Position::FirstPositionInNode(new_block))
+                         .Collapse(Position::FirstPositionInNode(*new_block))
                          .SetIsDirectional(EndingSelection().IsDirectional())
                          .Build());
 
   style->PrepareToApplyAt(EndingSelection().Start());
   if (!style->IsEmpty()) {
     ApplyStyle(style, editing_state);
     if (editing_state->IsAborted())
       return false;
   }
 
@@ skipping 282 matching lines @@
 
 DEFINE_TRACE(CompositeEditCommand) {
   visitor->Trace(commands_);
   visitor->Trace(starting_selection_);
   visitor->Trace(ending_selection_);
   visitor->Trace(undo_step_);
   EditCommand::Trace(visitor);
 }
 
 }  // namespace blink