Remove OwnPtr from Blink.

third_party/WebKit/Source/web/LocalFileSystemClient.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 LocalFileSystemClient_h
 #define LocalFileSystemClient_h
 
 #include "modules/filesystem/FileSystemClient.h"
 #include "wtf/Forward.h"
+#include <memory>
 
 namespace blink {
 
 class LocalFileSystemClient final : public FileSystemClient {
 public:
-    static PassOwnPtr<FileSystemClient> create();
+    static std::unique_ptr<FileSystemClient> create();
 
     ~LocalFileSystemClient() override;
 
     bool requestFileSystemAccessSync(ExecutionContext*) override;
-    void requestFileSystemAccessAsync(ExecutionContext*, PassOwnPtr<ContentSettingCallbacks>) override;
+    void requestFileSystemAccessAsync(ExecutionContext*, std::unique_ptr<ContentSettingCallbacks>) override;
 
 private:
     LocalFileSystemClient();
 };
 
 } // namespace blink
 
 #endif // LocalFileSystemClient_h