src/vs/workbench/services/workingCopy/common/workingCopyBackupTracker.ts/WorkingCopyBackupTracker/cancelBackup
class WorkingCopyBackupTracker:	private cancelBackup(workingCopy: IWorkingCopy): void {
		dispose(this.pendingBackups.get(workingCopy));
		this.pendingBackups.delete(workingCopy);
	}