Remove OwnPtr from Blink.

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

Index: third_party/WebKit/Source/core/xml/XPathParser.h
diff --git a/third_party/WebKit/Source/core/xml/XPathParser.h b/third_party/WebKit/Source/core/xml/XPathParser.h
index 7e9228a2fa0784689cbf7b45cf75c30a33dd7850..dcf7aa8bb3a38d7b4fef0756b2e5a1eb0174d715 100644
--- a/third_party/WebKit/Source/core/xml/XPathParser.h
+++ b/third_party/WebKit/Source/core/xml/XPathParser.h
@@ -30,6 +30,7 @@
 #include "core/xml/XPathPredicate.h"
 #include "core/xml/XPathStep.h"
 #include "wtf/Allocator.h"
+#include <memory>
 
 namespace blink {
 
@@ -108,7 +109,7 @@ private:
     int m_lastTokenType;
     Member<XPathNSResolver> m_resolver;
 
-    HashSet<OwnPtr<String>> m_strings;
+    HashSet<std::unique_ptr<String>> m_strings;
 };
 
 } // namespace XPath