Profile chooser on mac was passing wrong value to signin error controller.  At the same time, I noticed another case where an infinite spinner could happen on any platform, see fix in inline_login_handler_impl.cc.

Fixed MutableProfileOAuth2TokenService to canonicalize the primary account id given to it in order to properly support loading older profiles.  This could cause chrome to show an auth error even after a successful reauth.

Refactored auth error providers to provide only the account id.
Signin error controller should no longer care about username.

BUG=476739

Review URL: https://codereview.chromium.org/1094103005

Cr-Commit-Position: refs/heads/master@{#327307}