Prefer using Disposable.None vs custom noop disposable

src/vs/workbench/test/electron-browser/api/extHostMessagerService.test.ts

@@ -28,8 +28,8 @@ const emptyDialogService = new class implements IDialogService {
 
 const emptyCommandService: ICommandService = {
 	_serviceBrand: undefined,
-	onWillExecuteCommand: () => ({ dispose: () => { } }),
-	onDidExecuteCommand: () => ({ dispose: () => { } }),
+	onWillExecuteCommand: () => Disposable.None,
+	onDidExecuteCommand: () => Disposable.None,
 	executeCommand: (commandId: string, ...args: any[]): Promise<any> => {
 		return Promise.resolve(undefined);
 	}