[Push] Use proper accessors for PushMessagingApplicationId.

chrome/browser/services/gcm/push_messaging_application_id.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 CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_APPLICATION_ID_H_
 #define CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_APPLICATION_ID_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 36 matching lines @@
   ~PushMessagingApplicationId();
 
   // Persist this application id to disk.
   void PersistToDisk(Profile* profile) const;
 
   // Delete this application id from disk.
   void DeleteFromDisk(Profile* profile) const; // TODO: Does const make sense?
 
   bool IsValid() const;
 
-  const std::string app_id_guid;
-  const GURL origin;
-  const int64 service_worker_registration_id;
+  const std::string& app_id_guid() const { return app_id_guid_; }
+  const GURL& origin() const { return origin_; }
+  int64 service_worker_registration_id() const {
+    return service_worker_registration_id_;
+  }
 
  private:
   friend class PushMessagingApplicationIdTest;
 
   // Constructs an invalid app id.
   PushMessagingApplicationId();
   // Constructs a valid app id.
   PushMessagingApplicationId(const std::string& app_id_guid,
                              const GURL& origin,
                              int64 service_worker_registration_id);
+
+  const std::string app_id_guid_;
+  const GURL origin_;
+  const int64 service_worker_registration_id_;
 };
 
 }  // namespace gcm
 
 #endif  // CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_APPLICATION_ID_H_