Revert of [sync]: add ManagedUserSigninManagerWrapper and pass to ProfileSyncService (https://codereview.chromium.org/137753012/)

Reason for revert:
Possible build bustage on Win64.

Original issue's description:
> [sync]: add ManagedUserSigninManagerWrapper and pass to ProfileSyncService
> 
> BUG=80194
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250814

TBR=bauerb@chromium.org,rogerta@chromium.org,pavely@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=80194

Review URL: https://codereview.chromium.org/162943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250967 0039d316-1c4b-4281-b951-d872f2087c98