src/vs/platform/configuration/common/configurationModels.ts/ConfigurationModel/getContentsForOverrideIdentifer
class ConfigurationModel:	private getContentsForOverrideIdentifer(identifier: string): any {
		for (const override of this.overrides) {
			if (override.identifiers.indexOf(identifier) !== -1) {
				return override.contents;
			}
		}
		return null;
	}