src/vs/workbench/contrib/extensions/common/extensions.ts/ExtensionContainers/constructor
class ExtensionContainers:	constructor(
		private readonly containers: IExtensionContainer[],
		@IExtensionsWorkbenchService extensionsWorkbenchService: IExtensionsWorkbenchService
	) {
		super();
		this._register(extensionsWorkbenchService.onChange(this.update, this));
	}