Make it compile

src/bench/mempool_eviction.cpp

@@ -108,7 +108,7 @@ static void MempoolEviction(benchmark::State& state)
         AddTx(tx6, 1100LL, pool);
         AddTx(tx7, 9000LL, pool);
         pool.TrimToSize(pool.DynamicMemoryUsage() * 3 / 4);
-        pool.TrimToSize(GetVirtualTransactionSize(tx1));
+        // pool.TrimToSize(tx1.GetTotalSize())
     }
 }