src/vs/platform/download/common/downloadIpc.ts/DownloadServiceChannelClient/download
class DownloadServiceChannelClient:	async download(from: URI, to: URI): Promise<void> {
		const uriTransfomer = this.getUriTransformer();
		if (uriTransfomer) {
			from = uriTransfomer.transformOutgoingURI(from);
			to = uriTransfomer.transformOutgoingURI(to);
		}
		await this.channel.call('download', [from, to]);
	}