Move GET_ACCOUNTS permission check to AccountManagerDelegate

Move GET_ACCOUNTS permission check to AccountManagerDelegate

Currently the AccountManagerHelper always checks the GET_ACCOUNTS
permission. This should instead be done directly by the
AccountManagerDelegate.

BUG=509826
Committed: https://crrev.com/8fa468ef1d57bf34a0fd81c33a8866536e04f58a
Cr-Commit-Position: refs/heads/master@{#339710}

[nyquist, 2015-07-21 18:10:25]

The CQ bit was checked by nyquist@chromium.org to run a CQ dry run

[nyquist, 2015-07-21 18:10:33]

nyquist@chromium.org changed reviewers:
+ tedchoc@chromium.org

[nyquist, 2015-07-21 18:10:34]

tedchoc: PTAL

[commit-bot: I haz the power, 2015-07-21 18:11:32]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1247053002/1

[Ted C, 2015-07-21 18:38:11]

lgtm

[commit-bot: I haz the power, 2015-07-21 18:51:48]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-21 18:51:49]

Dry run: This issue passed the CQ dry run.

[nyquist, 2015-07-21 18:51:53]

The CQ bit was checked by nyquist@chromium.org

[commit-bot: I haz the power, 2015-07-21 18:53:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1247053002/1

[commit-bot: I haz the power, 2015-07-21 19:01:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-21 19:02:09]

Patchset 1 (id:??) landed as
https://crrev.com/8fa468ef1d57bf34a0fd81c33a8866536e04f58a
Cr-Commit-Position: refs/heads/master@{#339710}