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

components/signin/core/browser/signin_error_controller.h

Index: components/signin/core/browser/signin_error_controller.h
diff --git a/components/signin/core/browser/signin_error_controller.h b/components/signin/core/browser/signin_error_controller.h
index 368b916a84eae7162bb245b7adff0e97964e2f52..2eea9a50da6d10710b9f9396d1f60b75b7dfafa9 100644
--- a/components/signin/core/browser/signin_error_controller.h
+++ b/components/signin/core/browser/signin_error_controller.h
@@ -26,9 +26,6 @@ class SigninErrorController : public KeyedService {
     // Returns the account id with the status specified by GetAuthStatus().
     virtual std::string GetAccountId() const = 0;
 
-    // Returns the username with the status specified by GetAuthStatus().
-    virtual std::string GetUsername() const = 0;
-
     // API invoked by SigninErrorController to get the current auth status of
     // the various signed in services.
     virtual GoogleServiceAuthError GetAuthStatus() const = 0;
@@ -63,7 +60,6 @@ class SigninErrorController : public KeyedService {
   void RemoveObserver(Observer* observer);
 
   const std::string& error_account_id() const { return error_account_id_; }
-  const std::string& error_username() const { return error_username_; }
   const GoogleServiceAuthError& auth_error() const { return auth_error_; }
 
  private:
@@ -71,7 +67,6 @@ class SigninErrorController : public KeyedService {
 
   // The account that generated the last auth error.
   std::string error_account_id_;
-  std::string error_username_;
 
   // The auth error detected the last time AuthStatusChanged() was invoked (or
   // NONE if AuthStatusChanged() has never been invoked).