Allow legacy supervised users to login with invalid oath tokens.

Allow legacy supervised users to login with invalid oath tokens.

Currently we force online login for legacy supervised users when the oauth
token becomes invalid. However there is no online login for legacy supervised
users - we just print a cryptic error message, and there is no way to refresh
this oauth token, so the account is effectively locked.

BUG=chromium:659788
TEST=manual

Review-Url: https://codereview.chromium.org/2563573002
Cr-Commit-Position: refs/heads/master@{#438786}
(cherry picked from commit 9b57da68302423b74d098c015c97dfe7c9c94ba6)

Committed: https://chromium.googlesource.com/chromium/src/+/b1cdc3f6a193cb841dff5dfbb15bd73342665606

[Alexander Alekseev, 2016-12-15 22:47:36]

Description was changed from

==========
Allow legacy supervised users to login with invalid oath tokens.

Currently we force online login for legacy supervised users when the oauth
token becomes invalid. However there is no online login for legacy supervised
users - we just print a cryptic error message, and there is no way to refresh
this oauth token, so the account is effectively locked.

BUG=chromium:659788
TEST=manual

Review-Url: https://codereview.chromium.org/2563573002
Cr-Commit-Position: refs/heads/master@{#438786}
(cherry picked from commit 9b57da68302423b74d098c015c97dfe7c9c94ba6)
==========

to

==========
Allow legacy supervised users to login with invalid oath tokens.

Currently we force online login for legacy supervised users when the oauth
token becomes invalid. However there is no online login for legacy supervised
users - we just print a cryptic error message, and there is no way to refresh
this oauth token, so the account is effectively locked.

BUG=chromium:659788
TEST=manual

Review-Url: https://codereview.chromium.org/2563573002
Cr-Commit-Position: refs/heads/master@{#438786}
(cherry picked from commit 9b57da68302423b74d098c015c97dfe7c9c94ba6)

Committed:
https://chromium.googlesource.com/chromium/src/+/b1cdc3f6a193cb841dff5dfbb15b...
==========

[Alexander Alekseev, 2016-12-15 22:47:37]

Committed patchset #1 (id:1) manually as
b1cdc3f6a193cb841dff5dfbb15bd73342665606.