Support a negation pseudo-class, :not(), in <content select>

Source/core/css/CSSSelector.cpp

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  *               2001 Andreas Schlapbach (schlpbch@iam.unibe.ch)
  *               2001-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 757 matching lines @@
     case CSSSelector::PseudoNthLastChild:
     case CSSSelector::PseudoNthOfType:
     case CSSSelector::PseudoNthLastOfType:
     case CSSSelector::PseudoFirstChild:
     case CSSSelector::PseudoLastChild:
     case CSSSelector::PseudoFirstOfType:
     case CSSSelector::PseudoLastOfType:
     case CSSSelector::PseudoOnlyOfType:
     case CSSSelector::PseudoHost:
     case CSSSelector::PseudoHostContext:
+    case CSSSelector::PseudoNot:
         return true;
     default:
         return false;
     }
 }
 
 bool CSSSelector::isCompound() const
 {
     if (!validateSubSelector(this))
         return false;
@@ skipping 96 matching lines @@
             return false;
         return (count - m_b) % m_a == 0;
     } else {
         if (count > m_b)
             return false;
         return (m_b - count) % (-m_a) == 0;
     }
 }
 
 } // namespace WebCore