Fix cleanup in CredentialManagerClientTest

Fix cleanup in CredentialManagerClientTest

CredentialManagerClientTest allocates a client and a credential in test
setup, but doesn't free the client in the teardown.

BUG=

Committed: https://crrev.com/4cf7a62e423cdff018ffa3c4a60e5c7df0068fc8
Cr-Commit-Position: refs/heads/master@{#328878}

[nasko, 2015-05-07 22:56:32]

nasko@chromium.org changed reviewers:
+ mkwst@chromium.org

[nasko, 2015-05-07 22:56:32]

Hey Mike,
Can you review this CL for me? It balances the allocation in test setup with a
cleanup in teardown.
Thanks in advance!
Nasko

[Mike West, 2015-05-07 23:01:26]

LGTM!

[nasko, 2015-05-07 23:02:24]

The CQ bit was checked by nasko@chromium.org

[commit-bot: I haz the power, 2015-05-07 23:04:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1124393003/1

[commit-bot: I haz the power, 2015-05-07 23:31:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-07 23:32:11]

Patchset 1 (id:??) landed as
https://crrev.com/4cf7a62e423cdff018ffa3c4a60e5c7df0068fc8
Cr-Commit-Position: refs/heads/master@{#328878}