src/vs/workbench/api/common/extHostProgress.ts/ExtHostProgress/$acceptProgressCanceled
class ExtHostProgress:	public $acceptProgressCanceled(handle: number): void {
		const source = this._mapHandleToCancellationSource.get(handle);
		if (source) {
			source.cancel();
			this._mapHandleToCancellationSource.delete(handle);
		}
	}