[s13n] Deploy the replacement PO2TS::LoadCredentials in account_reconcilor_unittest.cc

This is a follow up of [1], when the IdentityManager::LegacyLoadCredentials
API was added.

[1] https://chromium-review.googlesource.com/c/1412775

BUG=910581

Change-Id: If6faf0d242149ec57d2560c2c6d4d6295907c2cd
Reviewed-on: https://chromium-review.googlesource.com/c/1425659
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625154}
1 file changed