Get rid of unnecessary std::unique_ptr from session_test.cc. #codehealth
Get rid of unnecessary std::unique_ptr from session_test.cc. #codehealth

PiperOrigin-RevId: 427607917

fcitx/mozc,fcitx/mozc,fcitx/mozc,fcitx/mozc,google/mozc,google/mozc,fcitx/mozc,google/mozc,google/mozc,google/mozc