Fix JavaScript platform after MainLoop methods rename.

platform/javascript/http_client_javascript.cpp

@@ -220,13 +220,13 @@ Error HTTPClient::poll() {
 				has_polled = true;
 			} else {
 				// forcing synchronous requests is not possible on the web
-				if (last_polling_frame == Engine::get_singleton()->get_idle_frames()) {
+				if (last_polling_frame == Engine::get_singleton()->get_process_frames()) {
 					WARN_PRINT("HTTPClient polled multiple times in one frame, "
 							   "but request cannot progress more than once per "
 							   "frame on the HTML5 platform.");
 				}
 			}
-			last_polling_frame = Engine::get_singleton()->get_idle_frames();
+			last_polling_frame = Engine::get_singleton()->get_process_frames();
 #endif
 
 			polled_response_code = godot_xhr_get_status(xhr_id);

platform/javascript/javascript_main.cpp

@@ -87,7 +87,7 @@ extern EMSCRIPTEN_KEEPALIVE int godot_js_main(int argc, char *argv[]) {
 	ResourceLoader::set_abort_on_missing_resources(false);
 
 	Main::start();
-	os->get_main_loop()->init();
+	os->get_main_loop()->initialize();
 	emscripten_set_main_loop(main_loop_callback, -1, false);
 	// Immediately run the first iteration.
 	// We are inside an animation frame, we want to immediately draw on the newly setup canvas.