Revert 241610 "cros: Use OAUTH_TOKEN_STATUS_UNKNOWN while loadin..."

Speculative. This bot has been red continuously since this build:
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%282%29/builds/10024

...and this is one of the few cros-specific CLs on that build. I'll put it back
in if the revert doesn't help.

> cros: Use OAUTH_TOKEN_STATUS_UNKNOWN while loading token from db.
> 
> "Invalid" token status has side effect and causes issue 328920.
> "Unknown" status works with 328920 and still sends user to Gaia
> if loading from db fails for issue 328065.
> 
> BUG=328065,328920
> 
> Review URL: https://codereview.chromium.org/117443002

TBR=xiyuan@chromium.org

Review URL: https://codereview.chromium.org/120433003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242275 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242275