Profile chooser on mac was passing wrong value to signin error controller.

components/signin/core/browser/signin_error_controller.cc

Index: components/signin/core/browser/signin_error_controller.cc
diff --git a/components/signin/core/browser/signin_error_controller.cc b/components/signin/core/browser/signin_error_controller.cc
index 2d35e85209672d342f4ebf38da09d7f801588ffb..1fa6e9f9112453b4fc0f73fa50392862f1642d5b 100644
--- a/components/signin/core/browser/signin_error_controller.cc
+++ b/components/signin/core/browser/signin_error_controller.cc
@@ -64,13 +64,11 @@ void SigninErrorController::AuthStatusChanged() {
     }
 
     std::string account_id = (*it)->GetAccountId();
-    std::string username = (*it)->GetUsername();
 
     // Prioritize this error if it matches the previous |auth_error_|.
     if (error.state() == prev_state && account_id == prev_account_id) {
       auth_error_ = error;
       error_account_id_ = account_id;
-      error_username_ = username;
       error_changed = true;
       break;
     }
@@ -80,7 +78,6 @@ void SigninErrorController::AuthStatusChanged() {
     if (!error_changed) {
       auth_error_ = error;
       error_account_id_ = account_id;
-      error_username_ = username;
       error_changed = true;
     }
   }
@@ -89,7 +86,6 @@ void SigninErrorController::AuthStatusChanged() {
     // No provider reported an error, so clear the error we have now.
     auth_error_ = GoogleServiceAuthError::AuthErrorNone();
     error_account_id_.clear();
-    error_username_.clear();
     error_changed = true;
   }