cashew: support additional usage API error result strings

src/service.h

 // Copyright (c) 2010 The Chromium OS 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 SRC_SERVICE_H_
 #define SRC_SERVICE_H_
 
 #include <glib.h>
 
 #include <map>
@@ skipping 172 matching lines @@
     bool CreateUpdateTimer();
 
     // stop and destroy the update timer if it exists
     void DestroyUpdateTimer();
 
     // delete carrier usage API proxy and policy if they exist
     // this also destroys the update timer and cancels pending requests
     // NOTE: this does not delete usage url (it's considered service state)
     void DeleteCarrierState();
 
+    // does |status| contain a valid usage API status result string?
+    bool IsValidCrosUsageStatus(const std::string& status) const;
+
+    // usage API request returned an error result
+    void OnCrosUsageErrorResult(const std::string& status);
+
     DISALLOW_COPY_AND_ASSIGN(Service);
 };
 
 }  // namespace cashew
 
 #endif  // SRC_SERVICE_H_