src/vs/platform/configuration/common/configurationRegistry.ts/ConfigurationRegistry/removeFromSchema
class ConfigurationRegistry:	private removeFromSchema(key: string, property: IConfigurationPropertySchema): void {
		delete allSettings.properties[key];
		switch (property.scope) {
			case ConfigurationScope.APPLICATION:
				delete applicationSettings.properties[key];
				break;
			case ConfigurationScope.MACHINE:
				delete machineSettings.properties[key];
				break;
			case ConfigurationScope.MACHINE_OVERRIDABLE:
				delete machineOverridableSettings.properties[key];
				break;
			case ConfigurationScope.WINDOW:
				delete windowSettings.properties[key];
				break;
			case ConfigurationScope.RESOURCE:
			case ConfigurationScope.LANGUAGE_OVERRIDABLE:
				delete resourceSettings.properties[key];
				delete this.resourceLanguageSettingsSchema.properties![key];
				break;
		}
	}