Remove unused code from wallet and validation interface

Fixes #6109

src/wallet/wallet.cpp

@@ -775,18 +775,6 @@ void CWallet::SyncTransaction(const CTransaction& tx, const CBlock* pblock)
     }
 }
 
-void CWallet::EraseFromWallet(const uint256 &hash)
-{
-    if (!fFileBacked)
-        return;
-    {
-        LOCK(cs_wallet);
-        if (mapWallet.erase(hash))
-            CWalletDB(strWalletFile).EraseTx(hash);
-    }
-    return;
-}
-
 
 isminetype CWallet::IsMine(const CTxIn &txin) const
 {

src/wallet/wallet.h

@@ -615,7 +615,6 @@ public:
     bool AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletDB* pwalletdb);
     void SyncTransaction(const CTransaction& tx, const CBlock* pblock);
     bool AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate);
-    void EraseFromWallet(const uint256 &hash);
     int ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate = false);
     void ReacceptWalletTransactions();
     void ResendWalletTransactions(int64_t nBestBlockTime);