Browser: Handle close event in WebContentView

Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/54a1ec2f10
Pull-request: https://github.com/SerenityOS/serenity/pull/17742
Reviewed-by: https://github.com/linusg

Userland/Applications/Browser/Tab.cpp

@@ -468,6 +468,10 @@ Tab::Tab(BrowserWindow& window)
             go_forward();
     };
 
+    view().on_close = [this] {
+        on_tab_close_request(*this);
+    };
+
     m_tab_context_menu = GUI::Menu::construct();
     m_tab_context_menu->add_action(GUI::CommonActions::make_reload_action([this](auto&) {
         reload();