Remove TdCallback::on_closed

GitOrigin-RevId: e08d6c10e4147c39f2d6f5ea795f92875644f1a7

td/telegram/Client.cpp

@@ -163,7 +163,7 @@ class Client::Impl final {
       void on_error(std::uint64_t id, td_api::object_ptr<td_api::error> error) override {
         output_queue_->writer_put({id, std::move(error)});
       }
-      void on_closed() override {
+      ~Callback() {
         Scheduler::instance()->finish();
       }
 

td/telegram/Td.cpp

@@ -3713,7 +3713,6 @@ void Td::on_closed() {
   close_flag_ = 5;
   send_update(
       td_api::make_object<td_api::updateAuthorizationState>(td_api::make_object<td_api::authorizationStateClosed>()));
-  callback_->on_closed();
   dec_stop_cnt();
 }
 

td/telegram/TdCallback.h

@@ -33,12 +33,6 @@ class TdCallback {
    */
   virtual void on_error(std::uint64_t id, td_api::object_ptr<td_api::error> error) = 0;
 
-  /**
-   * This function is called when TDLib has been fully closed. It's not possible to make any new requests after this function has been called
-   * without creating a new instance of ClientActor. The callback will be destroyed as soon as a call to this function returns.
-   */
-  virtual void on_closed() = 0;
-
   /**
    * Destroys the TdCallback.
    */

td/telegram/cli.cpp

@@ -673,7 +673,7 @@ class CliClient final : public Actor {
       void on_error(uint64 id, tl_object_ptr<td_api::error> error) override {
         client_->on_error(id, std::move(error));
       }
-      void on_closed() override {
+      ~TdCallbackImpl() {
         client_->on_closed();
       }
 

test/tdclient.cpp

@@ -81,7 +81,7 @@ class TestClient : public Actor {
       void on_error(uint64 id, tl_object_ptr<td_api::error> error) override {
         send_closure(client_, &TestClient::on_error, id, std::move(error));
       }
-      void on_closed() override {
+      ~TdCallbackImpl() {
         send_closure(client_, &TestClient::on_closed);
       }