No need to store invalid media queries.

Source/core/css/MediaList.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2010, 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 272 matching lines @@
         return;
 
     const Vector<OwnPtr<MediaQuery> >& mediaQueries = mediaQuerySet->queryVector();
     const size_t queryCount = mediaQueries.size();
 
     if (!queryCount)
         return;
 
     for (size_t i = 0; i < queryCount; ++i) {
         const MediaQuery* query = mediaQueries[i].get();
-        if (query->ignored() || equalIgnoringCase(query->mediaType(), "print"))
+        if (equalIgnoringCase(query->mediaType(), "print"))
             continue;
 
         const Vector<OwnPtr<MediaQueryExp> >* exps = query->expressions();
         for (size_t j = 0; j < exps->size(); ++j) {
             const MediaQueryExp* exp = exps->at(j).get();
             if (isResolutionMediaFeature(exp->mediaFeature())) {
                 CSSValue* cssValue =  exp->value();
                 if (cssValue && cssValue->isPrimitiveValue()) {
                     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(cssValue);
                     if (primitiveValue->isDotsPerInch() || primitiveValue->isDotsPerCentimeter())
                         addResolutionWarningMessageToConsole(document, mediaQuerySet->mediaText(), primitiveValue);
                 }
             }
         }
     }
 }
 
 }