Start removing the double-negative !ASSERT_DISABLED

Source/core/css/CSSStyleSheet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 56 matching lines @@
 #endif
 
     virtual unsigned length() const OVERRIDE { return m_styleSheet->length(); }
     virtual CSSRule* item(unsigned index) const OVERRIDE { return m_styleSheet->item(index); }
 
     virtual CSSStyleSheet* styleSheet() const OVERRIDE { return m_styleSheet; }
 
     RawPtrWillBeMember<CSSStyleSheet> m_styleSheet;
 };
 
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
 static bool isAcceptableCSSStyleSheetParent(Node* parentNode)
 {
     // Only these nodes can be parents of StyleSheets, and they need to call
     // clearOwnerNode() when moved out of document.
     // Destruction of the style sheet counts as being "moved out of the
     // document", but only in the non-oilpan version of blink. I.e. don't call
     // clearOwnerNode() in the owner's destructor in oilpan.
     return !parentNode
         || parentNode->isDocumentNode()
         || isHTMLLinkElement(*parentNode)
@@ skipping 372 matching lines @@
     visitor->trace(m_mediaQueries);
     visitor->trace(m_ownerNode);
     visitor->trace(m_ownerRule);
     visitor->trace(m_mediaCSSOMWrapper);
     visitor->trace(m_childRuleCSSOMWrappers);
     visitor->trace(m_ruleListCSSOMWrapper);
     StyleSheet::trace(visitor);
 }
 
 }