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