Implement InstanceID API functions.

components/gcm_driver/instance_id/instance_id.h

 // Copyright 2015 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_GCM_DRIVER_INSTANCE_ID_INSTANCE_ID_H_
 #define COMPONENTS_GCM_DRIVER_INSTANCE_ID_INSTANCE_ID_H_
 
 #include <map>
 #include <string>
 
@@ skipping 21 matching lines @@
     DISABLED,
     // Network socket error.
     NETWORK_ERROR,
     // Problem at the server.
     SERVER_ERROR,
     // Other errors.
     UNKNOWN_ERROR
   };
 
   // Asynchronous callbacks.
-  typedef base::Callback<void(InstanceID* instance_id,
+  typedef base::Callback<void(const std::string& app_id,
                               bool update_id)> TokenRefreshCallback;
-  typedef base::Callback<void(InstanceID* instance_id,
-                              const std::string& token,
+  typedef base::Callback<void(const std::string& token,
                               Result result)> GetTokenCallback;
-  typedef base::Callback<void(InstanceID* instance_id,
-                              Result result)> DeleteTokenCallback;
-  typedef base::Callback<void(InstanceID* instance_id,
-                              Result result)> DeleteIDCallback;
+  typedef base::Callback<void(Result result)> DeleteTokenCallback;
+  typedef base::Callback<void(Result result)> DeleteIDCallback;
 
   static const int kInstanceIDByteLength = 8;
 
   // Creator.
   // |app_id|: identifies the application that uses the Instance ID.
   // |gcm_driver|: driver to access the GCM functionalities needed to support
   //               Instance ID.
   static InstanceID* Create(const std::string& app_id,
                             gcm::GCMDriver* gcm_driver);
 
@@ skipping 49 matching lines @@
  private:
   std::string app_id_;
   TokenRefreshCallback token_refresh_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(InstanceID);
 };
 
 }  // namespace instance_id
 
 #endif  // COMPONENTS_GCM_DRIVER_INSTANCE_ID_INSTANCE_ID_H_