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

components/signin/ios/browser/profile_oauth2_token_service_ios.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SIGNIN_IOS_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_IOS_H_
 #define COMPONENTS_SIGNIN_IOS_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_IOS_H_
 
 #include <string>
 
 #include "base/threading/thread_checker.h"
@@ skipping 96 matching lines @@
   class AccountInfo : public SigninErrorController::AuthStatusProvider {
    public:
     AccountInfo(SigninErrorController* signin_error_controller,
                 const std::string& account_id);
     ~AccountInfo() override;
 
     void SetLastAuthError(const GoogleServiceAuthError& error);
 
     // SigninErrorController::AuthStatusProvider implementation.
     std::string GetAccountId() const override;
-    std::string GetUsername() const override;
     GoogleServiceAuthError GetAuthStatus() const override;
 
     bool marked_for_removal() const { return marked_for_removal_; }
     void set_marked_for_removal(bool marked_for_removal) {
       marked_for_removal_ = marked_for_removal;
     }
 
    private:
     SigninErrorController* signin_error_controller_;
     std::string account_id_;
@@ skipping 27 matching lines @@
 
   // Calls to this class are expected to be made from the browser UI thread.
   // The purpose of this checker is to detect access to
   // ProfileOAuth2TokenService from multiple threads in upstream code.
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileOAuth2TokenServiceIOS);
 };
 
 #endif  // COMPONENTS_SIGNIN_IOS_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_IOS_H_