src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/deregisterConfigurations
class ConfigurationRegistry:	public deregisterConfigurations(configurations: IConfigurationNode[]): void {
		const properties = this.doDeregisterConfigurations(configurations);

		contributionRegistry.registerSchema(resourceLanguageSettingsSchemaId, this.resourceLanguageSettingsSchema);
		this._onDidSchemaChange.fire();
		this._onDidUpdateConfiguration.fire({ properties });
	}