remove unused default mixin from wallet.cpp

src/wallet/api/wallet.cpp

@@ -60,7 +60,6 @@ namespace Monero {
 
 namespace {
     // copy-pasted from simplewallet
-    static const size_t DEFAULT_MIXIN = 9;
     static const int    DEFAULT_REFRESH_INTERVAL_MILLIS = 1000 * 10;
     // limit maximum refresh interval as one minute
     static const int    MAX_REFRESH_INTERVAL_MILLIS = 1000 * 60 * 1;
@@ -1406,15 +1405,6 @@ void WalletImpl::setListener(WalletListener *l)
     m_wallet2Callback->setListener(l);
 }
 
-uint32_t WalletImpl::defaultMixin() const
-{
-    return m_wallet->default_mixin();
-}
-
-void WalletImpl::setDefaultMixin(uint32_t arg)
-{
-    m_wallet->default_mixin(arg);
-}
 
 bool WalletImpl::setUserNote(const std::string &txid, const std::string &note)
 {