Drop [LegacyInterfaceTypeChecking] where trivial in core/

third_party/WebKit/Source/core/dom/TreeWalker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2008 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
@@ skipping 21 matching lines @@
 #include "core/dom/NodeTraversal.h"
 
 namespace blink {
 
 TreeWalker::TreeWalker(PassRefPtrWillBeRawPtr<Node> rootNode, unsigned whatToShow, PassRefPtrWillBeRawPtr<NodeFilter> filter)
     : NodeIteratorBase(rootNode, whatToShow, filter)
     , m_current(root())
 {
 }
 
-void TreeWalker::setCurrentNode(PassRefPtrWillBeRawPtr<Node> node, ExceptionState& exceptionState)
+void TreeWalker::setCurrentNode(PassRefPtrWillBeRawPtr<Node> node)
 {
-    if (!node) {
-        exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::argumentNullOrIncorrectType(1, "Node"));
-        return;
-    }
+    ASSERT(node);
     m_current = node;
 }
 
 inline Node* TreeWalker::setCurrent(PassRefPtrWillBeRawPtr<Node> node)
 {
     m_current = node;
     return m_current.get();
 }
 
 Node* TreeWalker::parentNode(ExceptionState& exceptionState)
@@ skipping 218 matching lines @@
     return 0;
 }
 
 DEFINE_TRACE(TreeWalker)
 {
     visitor->trace(m_current);
     NodeIteratorBase::trace(visitor);
 }
 
 } // namespace blink