src/vs/workbench/services/extensionManagement/common/extensionManagementService.ts/ExtensionManagementService/installWebExtension
class ExtensionManagementService:	async installWebExtension(location: URI): Promise<ILocalExtension> {
		if (!this.extensionManagementServerService.webExtensionManagementServer) {
			throw new Error('Web extension management server is not found');
		}
		return this.extensionManagementServerService.webExtensionManagementServer.extensionManagementService.install(location);
	}