scoped_ptr in chrome/base has been deprecated and removed ( issue 554298 ). libchrome in CrOS carries a patch (libchrome-395517-CHROMIUMOS-add-scoped-ptr.patch) that simply aliases scoped_ptr to std::unique_ptr for backward compatibility. However, scoped_ptr is still used in various CrOS code base and should be updated to std::unique_ptr.
Comment 1 by benchan@chromium.org
, Dec 8 2016