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

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

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 74 matching lines @@
   if (forward_range.IsNull() ||
       !Range::Create(*document, end_position, forward_range.StartPosition())
            ->GetText()
            .length())
     return;
 
   // Same as with the forward range but with the backward range. The range
   // starts at the document's or input element's start and ends at the selection
   // start and will be updated.
   BackwardsCharacterIterator backwards_iterator(
-      Position::FirstPositionInNode(root_element).ParentAnchoredEquivalent(),
+      Position::FirstPositionInNode(*root_element).ParentAnchoredEquivalent(),
       start_position,
       TextIteratorBehavior::Builder().SetStopsOnFormControls(true).Build());
   if (!backwards_iterator.AtEnd())
     backwards_iterator.Advance(half_max_length);
 
   const TextIteratorBehavior behavior =
       TextIteratorBehavior::NoTrailingSpaceRangeLengthBehavior();
   start_offset_in_content_ = TextIterator::RangeLength(
       backwards_iterator.EndPosition(), start_position, behavior);
   end_offset_in_content_ = TextIterator::RangeLength(
@@ skipping 15 matching lines @@
 
 unsigned SurroundingText::StartOffsetInContent() const {
   return start_offset_in_content_;
 }
 
 unsigned SurroundingText::EndOffsetInContent() const {
   return end_offset_in_content_;
 }
 
 }  // namespace blink