CANCELED: Make ComputeNodeBeforePosition() to return const Node*

third_party/WebKit/Source/core/html/TextControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 351 matching lines @@
 unsigned TextControlElement::IndexForPosition(HTMLElement* inner_editor,
                                               const Position& passed_position) {
   if (!inner_editor || !inner_editor->contains(passed_position.AnchorNode()) ||
       passed_position.IsNull())
     return 0;
 
   if (Position::BeforeNode(inner_editor) == passed_position)
     return 0;
 
   unsigned index = 0;
-  Node* start_node = passed_position.ComputeNodeBeforePosition();
+  const Node* start_node = passed_position.ComputeNodeBeforePosition();
   if (!start_node)
     start_node = passed_position.ComputeContainerNode();
   if (start_node == inner_editor && passed_position.IsAfterAnchor())
     start_node = inner_editor->lastChild();
   DCHECK(start_node);
   DCHECK(inner_editor->contains(start_node));
 
-  for (Node* node = start_node; node;
+  for (const Node* node = start_node; node;
        node = NodeTraversal::Previous(*node, inner_editor)) {
     if (node->IsTextNode()) {
       int length = ToText(*node).length();
       if (node == passed_position.ComputeContainerNode())
         index += std::min(length, passed_position.OffsetInContainerNode());
       else
         index += length;
     } else if (node->HasTagName(brTag)) {
       ++index;
     }
@@ skipping 580 matching lines @@
 
 void TextControlElement::CopyNonAttributePropertiesFromElement(
     const Element& source) {
   const TextControlElement& source_element =
       static_cast<const TextControlElement&>(source);
   last_change_was_user_edit_ = source_element.last_change_was_user_edit_;
   HTMLFormControlElement::CopyNonAttributePropertiesFromElement(source);
 }
 
 }  // namespace blink