Fix assert on unknown rule type in the BisonCSSParser::endRuleHeader.

Source/core/css/MediaQuerySetTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/MediaQuery.h"
 
 #include "core/css/MediaList.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/StringBuilder.h"
@@ skipping 139 matching lines @@
         {"all an[isdfs bla())()]icalc(i)(()), (max-width: 400px)", "not all, (max-width: 400px)", true},
         {"all an[isdfs bla())(]icalc(i)(()), (max-width: 500px)", "not all", true},
         {"all an[isdfs bla())(]icalc(i)(())), (max-width: 600px)", "not all", true},
         {"all an[isdfs bla())(]icalc(i)(()))], (max-width: 800px)", "not all, (max-width: 800px)", true},
         {"(max-width: '40px')", "not all", true},
         {"('max-width': 40px)", "not all", true},
         {"'\"'\", (max-width: 900px)", "not all", true},
         {"'\"\"\"', (max-width: 900px)", "not all, (max-width: 900px)", true},
         {"\"'\"', (max-width: 900px)", "not all", true},
         {"\"'''\", (max-width: 900px)", "not all, (max-width: 900px)", true},
+        {"s}", "not all", true},
+        {"s}, (color)", "not all, (color)", true},
         {0, 0} // Do not remove the terminator line.
     };
 
     for (unsigned i = 0; testCases[i].input; ++i) {
         RefPtrWillBeRawPtr<MediaQuerySet> oldParserQuerySet = MediaQuerySet::create(testCases[i].input);
         RefPtrWillBeRawPtr<MediaQuerySet> threadSafeQuerySet = MediaQuerySet::createOffMainThread(testCases[i].input);
         testMediaQuery(testCases[i], *oldParserQuerySet, true);
         testMediaQuery(testCases[i], *threadSafeQuerySet, false);
     }
 }
 
 } // namespace