src/vs/workbench/services/themes/browser/productIconThemeData.ts/ProductIconThemeData/load
class ProductIconThemeData:	private async load(fileService: IExtensionResourceLoaderService, logService: ILogService): Promise<string | undefined> {
		const location = this.location;
		if (!location) {
			return Promise.resolve(this.styleSheetContent);
		}
		const warnings: string[] = [];
		this.iconThemeDocument = await _loadProductIconThemeDocument(fileService, location, warnings);
		this.isLoaded = true;
		if (warnings.length) {
			logService.error(nls.localize('error.parseicondefs', "Problems processing product icons definitions in {0}:\n{1}", location.toString(), warnings.join('\n')));
		}
		return this.styleSheetContent;
	}