Introduce Node::containingTreeScope(), which asserts that the node's root is a tree scope

third_party/WebKit/Source/core/html/HTMLFormControlElement.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 161 matching lines @@
     }
 }
 
 void HTMLFormControlElement::disabledAttributeChanged()
 {
     setNeedsWillValidateCheck();
     pseudoStateChanged(CSSSelector::PseudoDisabled);
     pseudoStateChanged(CSSSelector::PseudoEnabled);
     if (layoutObject())
         LayoutTheme::theme().controlStateChanged(*layoutObject(), EnabledControlState);
-    if (isDisabledFormControl() && treeScope().adjustedFocusedElement() == this) {
+    if (isDisabledFormControl() && adjustedFocusedElementInTreeScope() == this) {
         // We might want to call blur(), but it's dangerous to dispatch events
         // here.
         document().setNeedsFocusedElementCheck();
     }
 }
 
 void HTMLFormControlElement::requiredAttributeChanged()
 {
     setNeedsValidityCheck();
     pseudoStateChanged(CSSSelector::PseudoRequired);
@@ skipping 461 matching lines @@
         dispatchFormControlChangeEvent();
 }
 
 void HTMLFormControlElement::copyNonAttributePropertiesFromElement(const Element& source)
 {
     HTMLElement::copyNonAttributePropertiesFromElement(source);
     setNeedsValidityCheck();
 }
 
 } // namespace blink