S2CellUnionTests Line 258-260 should be removed.

```
Line 258-260 as below should be removed:

if (!u.contains(xId)) {
u.getIntersection(xCells, yId);
}

It is extraneous and guarantees the subsequent assertTrue(u.contains(xId)); on
line 261 will always work even though this is the line that is being ultimately
tested.
```

Original issue reported on code.google.com by `uvico...@gmail.com` on 9 Jul 2013 at 1:39