Using a Bitcoin-Qt v0.16.0 ([downloaded from bitcoin page](https://bitcoin.org/bin/bitcoin-core-0.16.0/bitcoin-0.16.0-osx.dmg)) in an macOS High Sierra 10.13.4 

When I start after a fresh install Bitcoin-Qt as a mainnet node and wallet, the wallet prompt that about 203gb is going to be used in my disk
![image](https://user-images.githubusercontent.com/20187136/39899688-ba820bfe-5493-11e8-87d9-460ed5716a02.png)

When I start the node and wallet as testnet, shows the same message about the 203gb disk usage
![image](https://user-images.githubusercontent.com/20187136/39899756-17b31214-5494-11e8-8a57-60e604e74afb.png)

It seems that the second time the message is wrong, due that the testnet database uses about 14gb.
{
        const CBlockIndex* tip;
        {
            LOCK(::cs_main);
            tip = ::chainActive.Tip();
        }
        return GuessVerificationProgress(Params().TxData(), tip);
    }
    bool isInitialBlockDownload() override { return IsInitialBlockDownload(); }
    bool getReindex() override { return ::fReindex; }
    bool getImporting() override { return ::fImporting; }
    void setNetworkActive(bool active) override
    {
        if (g_connman) {
            g_connman->SetNetworkActive(active);
        }
    }
    bool getNetworkActive() override { return g_connman && g_connman->GetNetworkActive(); }
    CAmount getMaxTxFee() override { return ::maxTxFee; }
    CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) override
    {
        FeeCalculation fee_calc;
        CFeeRate result = ::feeEstimator.estimateSmartFee(num_blocks, &fee_calc, conservative);
        if (returned_target) {
            *returned_target = fee_calc.returnedTarget;
        }
        return result;
    }
    CFeeRate getDustRelayFee() override { return ::dustRelayFee; }