Update AffiliationFetcher to use new wire format.

Update AffiliationFetcher to use new Affiliation API wire format.

The new format is not backward compatible with the old one, therefore this CL updates the client side protobuf definitions to be in line with the API definition. However, this CL does not yet make use of any additional fields introduced in the new wire format.

BUG=437865
Committed: https://crrev.com/516abadc2553489ce28faeea4917280032fbe91d
Cr-Commit-Position: refs/heads/master@{#319860}

[engedy, 2015-03-10 10:03:33]

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

[Mike West, 2015-03-10 10:19:21]

LGTM.

[engedy, 2015-03-10 10:20:22]

The CQ bit was checked by engedy@chromium.org

[commit-bot: I haz the power, 2015-03-10 10:20:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/996613002/1

[commit-bot: I haz the power, 2015-03-10 11:24:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-10 11:25:34]

Patchset 1 (id:??) landed as
https://crrev.com/516abadc2553489ce28faeea4917280032fbe91d
Cr-Commit-Position: refs/heads/master@{#319860}