Fix GCMS::ListAccounts returning stale data on iOS.

Fix GCMS::ListAccounts returning stale data on iOS.

Marking the listed accounts cache as stale in GCMS is done by listening
to cookie changes (as this will catch any changes).
However, cookie changes notifications are not available on iOS, causing
the cache to be considered valid almost all the time.

This CL correctly marks the cache as stale for the most ususal actions
that will modify the listed accounts (AddAccount and LogOut).

BUG=653546
Committed: https://crrev.com/987cf5a621eae6c77edf3774ba08b3d55bb3bd49
Cr-Commit-Position: refs/heads/master@{#423576}

[bzanotti, 2016-10-06 14:42:51]

bzanotti@chromium.org changed reviewers:
+ rogerta@chromium.org

[bzanotti, 2016-10-06 14:42:52]

Please take a look.

Unrelated to the CL, but you and atwilson@ are still the only two owners of
components/signin. I think anthonyvd@ should be added in there, right?

[Roger Tawa OOO till Jul 10th, 2016-10-06 16:35:40]

lgtm

[bzanotti, 2016-10-06 16:37:11]

The CQ bit was checked by bzanotti@chromium.org

[commit-bot: I haz the power, 2016-10-06 16:37:34]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-06 17:38:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-06 17:40:34]

Description was changed from

==========
Fix GCMS::ListAccounts returning stale data on iOS.

Marking the listed accounts cache as stale in GCMS is done by listening
to cookie changes (as this will catch any changes).
However, cookie changes notifications are not available on iOS, causing
the cache to be considered valid almost all the time.

This CL correctly marks the cache as stale for the most ususal actions
that will modify the listed accounts (AddAccount and LogOut).

BUG=653546
==========

to

==========
Fix GCMS::ListAccounts returning stale data on iOS.

Marking the listed accounts cache as stale in GCMS is done by listening
to cookie changes (as this will catch any changes).
However, cookie changes notifications are not available on iOS, causing
the cache to be considered valid almost all the time.

This CL correctly marks the cache as stale for the most ususal actions
that will modify the listed accounts (AddAccount and LogOut).

BUG=653546

Committed: https://crrev.com/987cf5a621eae6c77edf3774ba08b3d55bb3bd49
Cr-Commit-Position: refs/heads/master@{#423576}
==========

[commit-bot: I haz the power, 2016-10-06 17:40:35]

Patchset 1 (id:??) landed as
https://crrev.com/987cf5a621eae6c77edf3774ba08b3d55bb3bd49
Cr-Commit-Position: refs/heads/master@{#423576}