Remove OwnPtr from Blink.

third_party/WebKit/Source/core/xml/XPathParser.h

 /*
  * Copyright 2005 Maksim Orlovich <maksim@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 12 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef XPathParser_h
 #define XPathParser_h
 
 #include "core/xml/XPathPredicate.h"
 #include "core/xml/XPathStep.h"
 #include "wtf/Allocator.h"
+#include <memory>
 
 namespace blink {
 
 class ExceptionState;
 class XPathNSResolver;
 
 namespace XPath {
 
 class Expression;
 class LocationPath;
@@ skipping 58 matching lines @@
 
     void reset(const String& data);
 
     static Parser* currentParser;
 
     unsigned m_nextPos;
     String m_data;
     int m_lastTokenType;
     Member<XPathNSResolver> m_resolver;
 
-    HashSet<OwnPtr<String>> m_strings;
+    HashSet<std::unique_ptr<String>> m_strings;
 };
 
 } // namespace XPath
 
 } // namespace blink
 
 int xpathyyparse(blink::XPath::Parser*);
 #endif