[Profiles] Delete test-only method from the ProfileInfoCache

[Profiles] Delete test-only method from the ProfileInfoCache

And move it to the only test that cares about it.

BUG=363524
TEST=Existing unit tests.

Committed: https://crrev.com/693f35aa1676ba7ff2d3ba7e950f56f20d510fe0
Cr-Commit-Position: refs/heads/master@{#314820}

[noms (inactive), 2015-02-04 17:43:15]

noms@chromium.org changed reviewers:
+ mlerman@chromium.org

[noms (inactive), 2015-02-04 17:43:15]

Brace yourself, refactor CLs are coming.

[Mike Lerman, 2015-02-05 13:43:11]

lgtm

[noms (inactive), 2015-02-05 15:59:08]

The CQ bit was checked by noms@chromium.org

[commit-bot: I haz the power, 2015-02-05 15:59:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884923004/1

[commit-bot: I haz the power, 2015-02-05 16:03:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 16:04:51]

Patchset 1 (id:??) landed as
https://crrev.com/693f35aa1676ba7ff2d3ba7e950f56f20d510fe0
Cr-Commit-Position: refs/heads/master@{#314820}