--- a/components/signin/core/browser/signin_manager.cc	2017-10-04 18:07:40.000000000 -0400
+++ b/components/signin/core/browser/signin_manager.cc	2017-10-08 19:41:04.598523530 -0400
@@ -270,7 +270,7 @@
 }
 
 bool SigninManager::IsSigninAllowed() const {
-  return signin_allowed_.GetValue();
+  return false;
 }
 
 void SigninManager::OnSigninAllowedPrefChanged() {