kernel: Fix implementation of ConvertSessionToDomain.

src/core/hle/kernel/server_session.h

@@ -91,14 +91,6 @@ public:
     /// TODO(Subv): Find a better name for this.
     SharedPtr<Thread> currently_handling;
 
-    void ConvertToDomain() {
-        is_domain = true;
-    }
-
-    bool IsDomain() const {
-        return is_domain;
-    }
-
 private:
     ServerSession();
     ~ServerSession() override;
@@ -110,8 +102,6 @@ private:
      * @return The created server session
      */
     static ResultVal<SharedPtr<ServerSession>> Create(std::string name = "Unknown");
-
-    bool is_domain{};
 };
 
 /**