Allow sync with 2-factor StrongAuth accounts in ChromeOS.

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index e150a31fb315516ed166cf662d16064f7425aafd..03f889c9e927ad034aec46767ae509e5f70a56ca 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -88,6 +88,7 @@ class ExistingUserController : public WmMessageListener::Observer,
   virtual void SetStatusAreaEnabled(bool enable);
 
   // LoginPerformer::Delegate implementation:
+  virtual void SetLoginFailure(const LoginFailure& error);
   virtual void OnLoginFailure(const LoginFailure& error);
   virtual void OnLoginSuccess(
       const std::string& username,
@@ -169,6 +170,9 @@ class ExistingUserController : public WmMessageListener::Observer,
   // A user settings provider instance to trigger settings cache update.
   scoped_ptr<UserCrosSettingsProvider> user_settings_;
 
+  // True if there was a two-factor error during login.
+  bool two_factor_error_;
+
   DISALLOW_COPY_AND_ASSIGN(ExistingUserController);
 };