Missing m_failedParsing=true for unresolved namespace.

third_party/WebKit/Source/core/css/parser/CSSSelectorParser.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 "core/css/parser/CSSSelectorParser.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ skipping 286 matching lines @@
             compoundPseudoElement = simpleSelector->pseudoType();
 
         if (compoundSelector)
             compoundSelector = addSimpleSelectorToCompound(compoundSelector.release(), simpleSelector.release());
         else
             compoundSelector = simpleSelector.release();
     }
 
     if (!compoundSelector) {
         AtomicString namespaceURI = determineNamespace(namespacePrefix);
-        if (namespaceURI.isNull())
+        if (namespaceURI.isNull()) {
+            m_failedParsing = true;
             return nullptr;
+        }
         return CSSParserSelector::create(QualifiedName(namespacePrefix, elementName, namespaceURI));
     }
     prependTypeSelectorIfNeeded(namespacePrefix, elementName, compoundSelector.get());
     return splitCompoundAtImplicitShadowCrossingCombinator(compoundSelector.release());
 }
 
 PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumeSimpleSelector(CSSParserTokenRange& range)
 {
     const CSSParserToken& token = range.peek();
     OwnPtr<CSSParserSelector> selector;
@@ skipping 444 matching lines @@
 
     if (!splitAfter || !splitAfter->tagHistory())
         return compoundSelector;
 
     OwnPtr<CSSParserSelector> secondCompound = splitAfter->releaseTagHistory();
     secondCompound->appendTagHistory(secondCompound->pseudoType() == CSSSelector::PseudoSlotted ? CSSSelector::ShadowSlot : CSSSelector::ShadowPseudo, compoundSelector);
     return secondCompound.release();
 }
 
 } // namespace blink