Make ExceptionState parameter of ContainerNode::querySelector() as an optional parameter

third_party/WebKit/Source/core/dom/ContainerNode.h

 /*
  * 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, 2009, 2010, 2011, 2013 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 65 matching lines @@
     bool hasChildren() const { return m_firstChild; }
 
     bool hasOneChild() const { return m_firstChild && !m_firstChild->nextSibling(); }
     bool hasOneTextChild() const { return hasOneChild() && m_firstChild->isTextNode(); }
     bool hasChildCount(unsigned) const;
 
     HTMLCollection* children();
 
     unsigned countChildren() const;
 
-    Element* querySelector(const AtomicString& selectors, ExceptionState&);
+    Element* querySelector(const AtomicString& selectors, ExceptionState& = ASSERT_NO_EXCEPTION);
     StaticElementList* querySelectorAll(const AtomicString& selectors, ExceptionState&);
 
     Node* insertBefore(Node* newChild, Node* refChild, ExceptionState& = ASSERT_NO_EXCEPTION);
     Node* replaceChild(Node* newChild, Node* oldChild, ExceptionState& = ASSERT_NO_EXCEPTION);
     Node* removeChild(Node* child, ExceptionState& = ASSERT_NO_EXCEPTION);
     Node* appendChild(Node* newChild, ExceptionState& = ASSERT_NO_EXCEPTION);
 
     Element* getElementById(const AtomicString& id) const;
     TagCollection* getElementsByTagName(const AtomicString&);
     TagCollection* getElementsByTagNameNS(const AtomicString& namespaceURI, const AtomicString& localName);
@@ skipping 241 matching lines @@
 inline void getChildNodes(ContainerNode& node, NodeVector& nodes)
 {
     DCHECK(!nodes.size());
     for (Node* child = node.firstChild(); child; child = child->nextSibling())
         nodes.append(child);
 }
 
 } // namespace blink
 
 #endif // ContainerNode_h