src/vs/platform/configuration/common/configurationModels.ts/ConfigurationModel/getKeysForOverrideIdentifier
class ConfigurationModel:	getKeysForOverrideIdentifier(identifier: string): string[] {
		for (const override of this.overrides) {
			if (override.identifiers.indexOf(identifier) !== -1) {
				return override.keys;
			}
		}
		return [];
	}