IDL: make optional arguments (without default) explicit sometimes

Source/core/html/HTMLTableRowElement.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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
@@ skipping 96 matching lines @@
     const Node* n = this;
     do {
         n = n->previousSibling();
         if (n && isHTMLTableRowElement(*n))
             ++rIndex;
     } while (n);
 
     return rIndex;
 }
 
-PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableRowElement::insertCell(ExceptionState& exceptionState)
-{
-    // The default 'index' argument value is -1.
-    return insertCell(-1, exceptionState);
-}
-
 PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableRowElement::insertCell(int index, ExceptionState& exceptionState)
 {
     RefPtrWillBeRawPtr<HTMLCollection> children = cells();
     int numCells = children ? children->length() : 0;
     if (index < -1 || index > numCells) {
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(index) + ") is outside the range [-1, " + String::number(numCells) + "].");
         return nullptr;
     }
 
     RefPtrWillBeRawPtr<HTMLTableCellElement> cell = HTMLTableCellElement::create(tdTag, document());
@@ skipping 17 matching lines @@
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(index) + ") is outside the range [0, " + String::number(numCells) + ").");
     }
 }
 
 PassRefPtrWillBeRawPtr<HTMLCollection> HTMLTableRowElement::cells()
 {
     return ensureCachedCollection<HTMLCollection>(TRCells);
 }
 
 }