Remove unused token_name

contracts/test_api/test_types.cpp

@@ -17,7 +17,6 @@ void test_types::types_size() {
    eosio_assert( sizeof(uint8_t) ==  1, "uint8_t size != 1");
 
    eosio_assert( sizeof(account_name) ==  8, "account_name size !=  8");
-   eosio_assert( sizeof(token_name) ==  8, "token_name size !=  8");
    eosio_assert( sizeof(table_name) ==  8, "table_name size !=  8");
    eosio_assert( sizeof(time) ==  4, "time size !=  4");
    eosio_assert( sizeof(eosio::key256) == 32, "key256 size != 32" );