src/vs/workbench/services/workspaces/browser/workspacesService.ts/BrowserWorkspacesService/deleteUntitledWorkspace
class BrowserWorkspacesService:	async deleteUntitledWorkspace(workspace: IWorkspaceIdentifier): Promise<void> {
		try {
			await this.fileService.del(workspace.configPath);
		} catch (error) {
			if ((<FileOperationError>error).fileOperationResult !== FileOperationResult.FILE_NOT_FOUND) {
				throw error; // re-throw any other error than file not found which is OK
			}
		}
	}