Revert 241609 "Add cross account error detection to inline signin"

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.

> Add cross account error detection to inline signin
> 
> BUG=318859
> R=rogerta@chromium.org, xiyuan@chromium.org
> 
> Review URL: https://codereview.chromium.org/116543007

TBR=guohui@chromium.org

Review URL: https://codereview.chromium.org/113293013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242298 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242298