Reject invert for outline-color at parse time.

third_party/WebKit/Source/core/dom/TextLinkColors.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
@@ skipping 47 matching lines @@
     m_activeLinkColor = Color(255, 0, 0);
 }
 
 Color TextLinkColors::colorFromCSSValue(const CSSValue& value, Color currentColor, bool forVisitedLink) const
 {
     if (value.isColorValue())
         return toCSSColorValue(value).value();
 
     CSSValueID valueID = toCSSPrimitiveValue(value).getValueID();
     switch (valueID) {
-    case 0:
+    case CSSValueInvalid:
+        NOTREACHED();
         return Color();
     case CSSValueInternalQuirkInherit:
         return textColor();
     case CSSValueWebkitLink:
         return forVisitedLink ? visitedLinkColor() : linkColor();
     case CSSValueWebkitActivelink:
         return activeLinkColor();
     case CSSValueWebkitFocusRingColor:
         return LayoutTheme::theme().focusRingColor();
-    case CSSValueInvert: // We don't support outline-color: invert
     case CSSValueCurrentcolor:
         return currentColor;
     default:
         return StyleColor::colorFromKeyword(valueID);
     }
 }
 
 } // namespace blink