The browser gem is quite inefficient for checking SameSite
compatibility. If we rewrite the checks, we see much better performance:

```
Warming up --------------------------------------
            no check    46.338k i/100ms
               check    21.325k i/100ms
Calculating -------------------------------------
            no check    446.012k (± 5.5%) i/s -      2.224M in   5.003135s
               check    210.757k (± 2.8%) i/s -      1.066M in   5.062987s

Comparison:
            no check:   446012.3 i/s
               check:   210756.9 i/s - 2.12x  (± 0.00) slower
```