src/vs/platform/policy/node/nativePolicyService.ts/NativePolicyService/_onDidPolicyChange
class NativePolicyService:	private _onDidPolicyChange(update: PolicyUpdate<IStringDictionary<PolicyDefinition>>): void {
		this.logService.trace(`NativePolicyService#_onDidPolicyChange - Updated policy values: ${JSON.stringify(update)}`);

		for (const key in update) {
			const value = update[key] as any;

			if (value === undefined) {
				this.policies.delete(key);
			} else {
				this.policies.set(key, value);
			}
		}

		this._onDidChange.fire(Object.keys(update));
	}