WebContent+WebDriver: Ensure Get Window Handle checks for closed BCs

Author: https://github.com/trflynn89
Commit: 0524bc1d13
Pull-request: https://github.com/SerenityOS/serenity/pull/17748
Reviewed-by: https://github.com/kalenikaliaksandr
Reviewed-by: https://github.com/linusg ✅

Userland/Services/WebContent/WebDriverConnection.h

@@ -93,7 +93,9 @@ private:
     virtual Messages::WebDriverClient::TakeElementScreenshotResponse take_element_screenshot(String const& element_id) override;
     virtual Messages::WebDriverClient::PrintPageResponse print_page() override;
 
+    virtual Messages::WebDriverClient::EnsureTopLevelBrowsingContextIsOpenResponse ensure_top_level_browsing_context_is_open() override;
     ErrorOr<void, Web::WebDriver::Error> ensure_open_top_level_browsing_context();
+
     ErrorOr<void, Web::WebDriver::Error> handle_any_user_prompts();
     void restore_the_window();
     Gfx::IntRect maximize_the_window();