Revert "Track empty username and password in PasswordStore."

Revert "Track empty username and password in PasswordStore."

This reverts https://codereview.chromium.org/493123002. There were too many generated crashes.

BUG=407767
Committed: https://crrev.com/7b9995c5960eab6cba301070fc26a8d95a30aa27
Cr-Commit-Position: refs/heads/master@{#292134}

[vasilii, 2014-08-27 09:17:35]

vasilii@chromium.org changed reviewers:
+ vabr@chromium.org

[vasilii, 2014-08-27 09:19:53]

Hi Vaclav,

please review ASAP. We need to land it today.

[vabr (Chromium), 2014-08-27 10:47:56]

LGTM, I checked both that it is a revert of
https://codereview.chromium.org/493123002, and that it makes sense.

Cheers,
Vaclav

[vasilii, 2014-08-27 10:48:39]

The CQ bit was checked by vasilii@chromium.org

[commit-bot: I haz the power, 2014-08-27 10:49:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vasilii@chromium.org/512673002/1

[commit-bot: I haz the power, 2014-08-27 11:22:42]

Committed patchset #1 (1) as c75ffec437147b59a4d42972d948c2a52a13f873

[commit-bot: I haz the power, 2014-09-10 02:51:05]

Patchset 1 (id:??) landed as
https://crrev.com/7b9995c5960eab6cba301070fc26a8d95a30aa27
Cr-Commit-Position: refs/heads/master@{#292134}