Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/webdatabase/DatabaseTracker.h

 /*
  * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
  *
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 20 matching lines @@
 
 #include "modules/ModulesExport.h"
 #include "modules/webdatabase/DatabaseError.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Functional.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/WTFString.h"
-#include <memory>
 
 namespace blink {
 
 class Database;
 class DatabaseContext;
 class Page;
 class SecurityOrigin;
 
 class MODULES_EXPORT DatabaseTracker {
     WTF_MAKE_NONCOPYABLE(DatabaseTracker); USING_FAST_MALLOC(DatabaseTracker);
@@ skipping 27 matching lines @@
     using DatabaseNameMap = HashMap<String, DatabaseSet*>;
     using DatabaseOriginMap = HashMap<String, DatabaseNameMap*>;
     class CloseOneDatabaseImmediatelyTask;
 
     DatabaseTracker();
 
     void closeOneDatabaseImmediately(const String& originIdentifier, const String& name, Database*);
 
     Mutex m_openDatabaseMapGuard;
 
-    mutable std::unique_ptr<DatabaseOriginMap> m_openDatabaseMap;
+    mutable OwnPtr<DatabaseOriginMap> m_openDatabaseMap;
 };
 
 } // namespace blink
 
 #endif // DatabaseTracker_h