ChromeOS: This CL fixes bug in UserManager::GetKnownUserAccountId .

components/user_manager/user_manager_base.h

Index: components/user_manager/user_manager_base.h
diff --git a/components/user_manager/user_manager_base.h b/components/user_manager/user_manager_base.h
index dd46c5d7d0d3a61d49a52db473b4ca5b023ff69b..138faf0ee340c49e3d8e1fda01a0f6f21b1c02ad 100644
--- a/components/user_manager/user_manager_base.h
+++ b/components/user_manager/user_manager_base.h
@@ -129,8 +129,8 @@ class USER_MANAGER_EXPORT UserManagerBase : public UserManager {
   void SetKnownUserIntegerPref(const AccountId& account_id,
                                const std::string& path,
                                int in_value) override;
-  bool GetKnownUserAccountId(const AccountId& authenticated_account_id,
-                             AccountId* out_account_id) override;
+  AccountId GetKnownUserAccountIdImpl(const std::string& user_email,
+                                      const std::string& gaia_id) override;
   void UpdateGaiaID(const AccountId& account_id,
                     const std::string& gaia_id) override;
   bool FindGaiaID(const AccountId& account_id, std::string* out_value) override;