Change deleteCell behavior when there are no cells

third_party/WebKit/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
@@ skipping 92 matching lines @@
     appendChild(cell, exceptionState);
   else
     insertBefore(cell, children->item(index), exceptionState);
   return cell;
 }
 
 void HTMLTableRowElement::deleteCell(int index,
                                      ExceptionState& exceptionState) {
   HTMLCollection* children = cells();
   int numCells = children ? children->length() : 0;
-  if (index == -1)
+  if (index == -1) {
+    if (numCells == 0)
+      return;
     index = numCells - 1;
+  }
   if (index >= 0 && index < numCells) {
     Element* cell = children->item(index);
     HTMLElement::removeChild(cell, exceptionState);
   } else {
     exceptionState.throwDOMException(
         IndexSizeError, "The value provided (" + String::number(index) +

[foolip, 2016/10/12 13:07:11]

Optional nit: could you reorder this so that it obviously matches the spec
exactly, step-by-step with spec comments?

[rwlbuis, 2016/10/12 13:48:37]

Good idea, done.

                             ") is outside the range [0, " +
                             String::number(numCells) + ").");
   }
 }
 
 HTMLCollection* HTMLTableRowElement::cells() {
   return ensureCachedCollection<HTMLCollection>(TRCells);
 }
 
 }  // namespace blink