Revert 225847 "Make the SigninGlobalError multi-login aware."

> Make the SigninGlobalError multi-login aware.
> 
> BUG=277149
> R=asvitkine@chromium.org, atwilson@chromium.org, courage@chromium.org, fgorski@chromium.org
> TBR=asvitkine@chromium.org
> 
> Review URL: https://codereview.chromium.org/23875028

TBR=rogerta@chromium.org

Review URL: https://codereview.chromium.org/25157002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225848 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225848