Remove unused function

extensions/vscode-api-tests/src/singlefolder-tests/terminal.test.ts

@@ -338,7 +338,3 @@ suite('window namespace tests', () => {
 		});
 	});
 });
-
-async function timeout(ms = 0): Promise<void> {
-	return new Promise<void>(resolve => setTimeout(() => resolve(), ms));
-}