Change enclosingTextControl to take const Node ptr

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 847 matching lines @@
 
 TextControlElement* enclosingTextControl(const Position& position) {
   DCHECK(position.isNull() || position.isOffsetInAnchor() ||
          position.computeContainerNode() ||
          !position.anchorNode()->ownerShadowHost() ||
          (position.anchorNode()->parentNode() &&
           position.anchorNode()->parentNode()->isShadowRoot()));
   return enclosingTextControl(position.computeContainerNode());
 }
 
-TextControlElement* enclosingTextControl(Node* container) {
+TextControlElement* enclosingTextControl(const Node* container) {
   if (!container)
     return nullptr;
   Element* ancestor = container->ownerShadowHost();
   return ancestor && isTextControlElement(*ancestor) &&
                  container->containingShadowRoot()->type() ==
                      ShadowRootType::UserAgent
              ? toTextControlElement(ancestor)
              : 0;
 }
 
@@ skipping 285 matching lines @@
 
 void TextControlElement::copyNonAttributePropertiesFromElement(
     const Element& source) {
   const TextControlElement& sourceElement =
       static_cast<const TextControlElement&>(source);
   m_lastChangeWasUserEdit = sourceElement.m_lastChangeWasUserEdit;
   HTMLFormControlElement::copyNonAttributePropertiesFromElement(source);
 }
 
 }  // namespace blink