Enable accessible name of a control to include multiple <label> elements.

third_party/WebKit/Source/core/html/HTMLLabelElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 53 matching lines @@
 
     void focus(const FocusParams&) override;
 
     // FormAssociatedElement methods
     bool isFormControlElement() const override { return false; }
     bool isEnumeratable() const override { return false; }
     bool isLabelElement() const override { return true; }
 
     void parseAttribute(const QualifiedName&, const AtomicString&, const AtomicString&) override;
 
-    void updateLabel(TreeScope&, const AtomicString& oldForAttributeValue, const AtomicString& newForAttributeValue);
-
     bool m_processingClick;
 };
 
 
 template<typename T> inline const T& toElement(const FormAssociatedElement&);
 template<typename T> inline const T* toElement(const FormAssociatedElement*);
 // Make toHTMLLabelElement() accept a FormAssociatedElement as input instead of a Node.
 template<> inline const HTMLLabelElement* toElement<HTMLLabelElement>(const FormAssociatedElement* element)
 {
     const HTMLLabelElement* labelElement = static_cast<const HTMLLabelElement*>(element);
     // FormAssociatedElement doesn't have hasTagName, hence check for assert.
     ASSERT_WITH_SECURITY_IMPLICATION(!labelElement || labelElement->hasTagName(HTMLNames::labelTag));
     return labelElement;
 }
 
 template<> inline const HTMLLabelElement& toElement<HTMLLabelElement>(const FormAssociatedElement& element)
 {
     const HTMLLabelElement& labelElement = static_cast<const HTMLLabelElement&>(element);
     // FormAssociatedElement doesn't have hasTagName, hence check for assert.
     ASSERT_WITH_SECURITY_IMPLICATION(labelElement.hasTagName(HTMLNames::labelTag));
     return labelElement;
 }
 
 } // namespace blink
 
 #endif // HTMLLabelElement_h