Move alert function from DisplayServer to OS.

platform/javascript/display_server_javascript.cpp

@@ -659,10 +659,6 @@ void DisplayServerJavaScript::send_window_event_callback(int p_notification) {
 	}
 }
 
-void DisplayServerJavaScript::alert(const String &p_alert, const String &p_title) {
-	godot_js_display_alert(p_alert.utf8().get_data());
-}
-
 void DisplayServerJavaScript::set_icon(const Ref<Image> &p_icon) {
 	ERR_FAIL_COND(p_icon.is_null());
 	Ref<Image> icon = p_icon;

platform/javascript/display_server_javascript.h

@@ -109,7 +109,6 @@ public:
 	bool check_size_force_redraw();
 
 	// from DisplayServer
-	virtual void alert(const String &p_alert, const String &p_title = "ALERT!") override;
 	virtual bool has_feature(Feature p_feature) const override;
 	virtual String get_name() const override;
 

platform/javascript/os_javascript.cpp

@@ -47,6 +47,10 @@
 
 #include "godot_js.h"
 
+void OS_JavaScript::alert(const String &p_alert, const String &p_title) {
+	godot_js_display_alert(p_alert.utf8().get_data());
+}
+
 // Lifecycle
 void OS_JavaScript::initialize() {
 	OS_Unix::initialize_core();

platform/javascript/os_javascript.h

@@ -89,6 +89,9 @@ public:
 	String get_user_data_dir() const override;
 
 	bool is_userfs_persistent() const override;
+
+	void alert(const String &p_alert, const String &p_title = "ALERT!") override;
+
 	Error open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path) override;
 
 	void resume_audio();