[Sync] Make Directory's protected methods private where possible

[Sync] Make Directory's protected methods private where possible

unrecoverable_error_set and one of the InitialSyncEndedForType overloads
are only called by Directory so they can be made private.

Remove name accessor as it's never called.

BUG=475557
Committed: https://crrev.com/41082e577df1e51a8cea10e95f3d909edab5d89c
Cr-Commit-Position: refs/heads/master@{#325529}

[maniscalco, 2015-04-16 19:38:40]

maniscalco@chromium.org changed reviewers:
+ pavely@chromium.org

[maniscalco, 2015-04-16 19:38:40]

Pavel, would you please review this change?

[pavely, 2015-04-16 20:11:45]

lgtm

[maniscalco, 2015-04-16 20:16:25]

On 2015/04/16 20:11:45, pavely wrote:
> lgtm

Thanks for the quick review!

[maniscalco, 2015-04-16 20:59:35]

The CQ bit was checked by maniscalco@chromium.org

[commit-bot: I haz the power, 2015-04-16 21:01:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1096543002/1

[commit-bot: I haz the power, 2015-04-16 22:47:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 22:48:06]

Patchset 1 (id:??) landed as
https://crrev.com/41082e577df1e51a8cea10e95f3d909edab5d89c
Cr-Commit-Position: refs/heads/master@{#325529}