Renamed internal ERC721 check function. (#1445)
Renamed internal ERC721 check function. (#1445)


(cherry picked from commit 384dff9abeee277f3357b8c472ef38a5ec825df3)

OpenZeppelin/zeppelin-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/zep-solidity,OpenZeppelin/zeppelin-solidity,OpenZeppelin/zep-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts