ash: Use session_manager::SessionState

ash/mus/bridge/wm_shell_mus.cc

Index: ash/mus/bridge/wm_shell_mus.cc
diff --git a/ash/mus/bridge/wm_shell_mus.cc b/ash/mus/bridge/wm_shell_mus.cc
index ed26084c8623ccd0ba875dd5022d1926e602d772..93265c2445d6de3f4d7f8f3426daafe41cc67948 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -75,7 +75,7 @@ class SessionStateDelegateStub : public SessionStateDelegate {
     screen_locked_ = false;
   }
   bool IsUserSessionBlocked() const override { return false; }
-  SessionState GetSessionState() const override { return SESSION_STATE_ACTIVE; }
+  SessionState GetSessionState() const override { return SessionState::ACTIVE; }
   const user_manager::UserInfo* GetUserInfo(UserIndex index) const override {
     return user_info_.get();
   }