Abandon user sign in when policy is retrieved before session started.

Abandon user sign in when policy is retrieved before session started.

If it happens that user policy is retrieved before session is started,
then there's no policy to apply to the user which could be used as
policy enforcement escape. This is a case when some flow went wrong,
and we abandon the user sign in.

BUG=689206
Review-Url: https://codereview.chromium.org/2801993002
Cr-Commit-Position: refs/heads/master@{#468000}
(cherry picked from commit f305a94dd4908c4975db3444e6b80732f48dcb39)

Review-Url: https://codereview.chromium.org/2877503002 .
Cr-Commit-Position: refs/branch-heads/3071@{#502}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/1de6fb83edb4dccdfd53ee5db5ae8b6b59fb24dc

[emaxx, 2017-05-10 15:00:57]

Description was changed from

==========
Abandon user sign in when policy is retrieved before session started.

If it happens that user policy is retrieved before session is started,
then there's no policy to apply to the user which could be used as
policy enforcement escape. This is a case when some flow went wrong,
and we abandon the user sign in.

BUG=689206

Review-Url: https://codereview.chromium.org/2801993002
Cr-Commit-Position: refs/heads/master@{#468000}
(cherry picked from commit f305a94dd4908c4975db3444e6b80732f48dcb39)
==========

to

==========
Abandon user sign in when policy is retrieved before session started.

If it happens that user policy is retrieved before session is started,
then there's no policy to apply to the user which could be used as
policy enforcement escape. This is a case when some flow went wrong,
and we abandon the user sign in.

BUG=689206

Review-Url: https://codereview.chromium.org/2801993002
Cr-Commit-Position: refs/heads/master@{#468000}
(cherry picked from commit f305a94dd4908c4975db3444e6b80732f48dcb39)

Review-Url: https://codereview.chromium.org/2877503002 .
Cr-Commit-Position: refs/branch-heads/3071@{#502}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/1de6fb83edb4dccdfd53ee5db5ae...
==========

[emaxx, 2017-05-10 15:00:59]

Committed patchset #1 (id:1) manually as
1de6fb83edb4dccdfd53ee5db5ae8b6b59fb24dc.