Fix selector namespace prefix resolution.

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

Index: third_party/WebKit/Source/core/dom/SelectorQuery.cpp
diff --git a/third_party/WebKit/Source/core/dom/SelectorQuery.cpp b/third_party/WebKit/Source/core/dom/SelectorQuery.cpp
index 37dbb07d7b9f13cb226c907fc9ebaf572d6cd496..dc4c9569eb13e6a8d63cb9fde02112a916674201 100644
--- a/third_party/WebKit/Source/core/dom/SelectorQuery.cpp
+++ b/third_party/WebKit/Source/core/dom/SelectorQuery.cpp
@@ -547,19 +547,13 @@ SelectorQuery* SelectorQueryCache::add(const AtomicString& selectors, const Docu
     if (it != m_entries.end())
         return it->value.get();
 
-    CSSSelectorList selectorList = CSSParser::parseSelector(CSSParserContext(document, nullptr), selectors);
+    CSSSelectorList selectorList = CSSParser::parseSelector(CSSParserContext(document, nullptr), nullptr, selectors);
 
     if (!selectorList.first()) {
         exceptionState.throwDOMException(SyntaxError, "'" + selectors + "' is not a valid selector.");
         return nullptr;
     }
 
-    // throw a NamespaceError if the selector includes any namespace prefixes.
-    if (selectorList.selectorsNeedNamespaceResolution()) {
-        exceptionState.throwDOMException(NamespaceError, "'" + selectors + "' contains namespaces, which are not supported.");
-        return nullptr;
-    }
-
     const unsigned maximumSelectorQueryCacheSize = 256;
     if (m_entries.size() == maximumSelectorQueryCacheSize)
         m_entries.remove(m_entries.begin());