accounts/abi/bind/backends: fix EstimateGas

accounts/abi/bind/backends/simulated.go

@@ -509,13 +509,7 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 		if failed {
 			if result != nil && result.Err != vm.ErrOutOfGas {
 				if len(result.Revert()) > 0 {
-					reason, err := abi.UnpackRevert(result.Revert())
-					if err == nil {
-						return 0, &revertError{
-							error:   errors.New("execution reverted"),
-							errData: reason,
-						}
-					}
+					return 0, newRevertError(result)
 				}
 				return 0, result.Err
 			}

accounts/abi/bind/backends/simulated_test.go

@@ -415,7 +415,7 @@ func TestSimulatedBackend_EstimateGas(t *testing.T) {
 			GasPrice: big.NewInt(0),
 			Value:    nil,
 			Data:     common.Hex2Bytes("d8b98391"),
-		}, 0, errors.New("execution reverted"), "revert reason"},
+		}, 0, errors.New("execution reverted: revert reason"), "0x08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000d72657665727420726561736f6e00000000000000000000000000000000000000"},
 
 		{"PureRevert", ethereum.CallMsg{
 			From:     addr,