Fix the DontSwapProcessWithOnlyRelNoreferrer test for --site-per-process

Fix the DontSwapProcessWithOnlyRelNoreferrer test for --site-per-process.

This test checks that following a cross-site link with rel="nofererrer" does not create a new SiteInstance per https://crbug.com/24447.  However, the test expectations should change with --site-per-process, as we do expect a process swap in this mode.  This is similar to how DontSwapProcessWithOnlyTargetBlank behaves (https://codereview.chromium.org/635933002/).

BUG=417518
Committed: https://crrev.com/347a917ac2b308dda446ce51c616fa1720adcfb8
Cr-Commit-Position: refs/heads/master@{#302103}

[alexmos, 2014-10-30 00:19:13]

alexmos@chromium.org changed reviewers:
+ creis@chromium.org

[alexmos, 2014-10-30 16:54:20]

Charlie, could you please take a look?

[Charlie Reis, 2014-10-30 16:58:55]

LGTM.

[alexmos, 2014-10-30 17:02:20]

The CQ bit was checked by alexmos@chromium.org

[commit-bot: I haz the power, 2014-10-30 17:02:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/692703002/1

[commit-bot: I haz the power, 2014-10-30 17:43:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-30 17:44:17]

Patchset 1 (id:??) landed as
https://crrev.com/347a917ac2b308dda446ce51c616fa1720adcfb8
Cr-Commit-Position: refs/heads/master@{#302103}