Remove gas stipend restriction in call to 721 receiver

contracts/token/ERC721/ERC721BasicToken.sol

@@ -13,9 +13,6 @@ contract ERC721BasicToken is ERC721Basic {
   using SafeMath for uint256;
   using AddressUtils for address;
   
-  // Gas allowed in calls to onERC721Received on safeTransfers
-  uint256 SAFE_TRANSFER_GAS_STIPEND = 50000;
-  
   // Equals to bytes4(keccak256("onERC721Received(address,uint256,bytes)"))
   bytes4 ERC721_RECEIVED = 0xf0b9e5ba; 
 
@@ -277,6 +274,6 @@ contract ERC721BasicToken is ERC721Basic {
   */
   function checkAndCallSafeTransfer(address _from, address _to, uint256 _tokenId, bytes _data) internal returns (bool) {
     return !_to.isContract() ||
-      (ERC721Receiver(_to).onERC721Received.gas(SAFE_TRANSFER_GAS_STIPEND)(_from, _tokenId, _data) == ERC721_RECEIVED);
+      (ERC721Receiver(_to).onERC721Received(_from, _tokenId, _data) == ERC721_RECEIVED);
   }
 }

test/token/ERC721/ERC721BasicToken.behaviour.js

@@ -245,7 +245,6 @@ export default function shouldBehaveLikeERC721BasicToken (accounts) {
               log.args._address.should.be.equal(owner);
               log.args._tokenId.toNumber().should.be.equal(tokenId);
               log.args._data.should.be.equal(data);
-              log.args._gas.toNumber().should.be.lessThan(50000);
             });
           });
         };