easy-unlock: Fix AttemptAuth email CHECK crash

easy-unlock: Fix AttemptAuth email CHECK crash

- Return canonicalized email from GetUserEmail because sign-in
  manager gives back the Gaia email which is not necessarily the
  same as the one used on the login screen;
- Sign-in manager gives empty user email when underlying refresh token
  is revoked. Bail out in this case.

BUG=489890
Committed: https://crrev.com/80f645c4e3fae03b22838c19d67cb60c2fb93203
Cr-Commit-Position: refs/heads/master@{#330890}

[xiyuan, 2015-05-20 22:32:01]

xiyuan@chromium.org changed reviewers:
+ tengs@chromium.org

[xiyuan, 2015-05-20 22:32:01]

Speculative fix since I am not able to repro.

[Tim Song, 2015-05-21 00:06:46]

https://codereview.chromium.org/1149873003/diff/20001/chrome/browser/signin/e...
File chrome/browser/signin/easy_unlock_service.cc (right):

https://codereview.chromium.org/1149873003/diff/20001/chrome/browser/signin/e...
chrome/browser/signin/easy_unlock_service.cc:499: return;
We should run the callback with a failure.

[xiyuan, 2015-05-21 01:30:54]

Patchset #3 (id:40001) has been deleted

[xiyuan, 2015-05-21 01:32:12]

https://codereview.chromium.org/1149873003/diff/20001/chrome/browser/signin/e...
File chrome/browser/signin/easy_unlock_service.cc (right):

https://codereview.chromium.org/1149873003/diff/20001/chrome/browser/signin/e...
chrome/browser/signin/easy_unlock_service.cc:499: return;
On 2015/05/21 00:06:46, Tim Song wrote:
> We should run the callback with a failure.

Good call. Done.

[Tim Song, 2015-05-21 01:53:02]

lgtm

[xiyuan, 2015-05-21 02:52:46]

The CQ bit was checked by xiyuan@chromium.org

[commit-bot: I haz the power, 2015-05-21 02:53:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149873003/60001

[commit-bot: I haz the power, 2015-05-21 04:39:57]

Committed patchset #3 (id:60001)

[commit-bot: I haz the power, 2015-05-21 04:42:24]

Patchset 3 (id:??) landed as
https://crrev.com/80f645c4e3fae03b22838c19d67cb60c2fb93203
Cr-Commit-Position: refs/heads/master@{#330890}