Remove associated keying material when unregistering from GCM

components/gcm_driver/crypto/gcm_encryption_provider.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_CRYPTO_GCM_ENCRYPTION_PROVIDER_H_
 #define COMPONENTS_GCM_DRIVER_CRYPTO_GCM_ENCRYPTION_PROVIDER_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 58 matching lines @@
   // avoid needing a blocking task runner for anything using GCMDriver.
   void Init(
       const base::FilePath& store_path,
       const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner);
 
   // Retrieves the public key and authentication secret associated with the
   // |app_id|. If none have been associated yet, they will be created.
   void GetEncryptionInfo(const std::string& app_id,
                          const EncryptionInfoCallback& callback);
 
+  // Removes all encryption information associated with the |app_id|. Will
+  // invoke the |callback| when this has finished.
+  void RemoveEncryptionInfo(const std::string& app_id,
+                            const base::Closure& callback);
+
   // Determines whether |message| contains encrypted content.
   bool IsEncryptedMessage(const IncomingMessage& message) const;
 
   // Asynchronously decrypts |message|. The |success_callback| will be invoked
   // the message could be decrypted successfully, accompanied by the decrypted
   // payload of the message. When decryption failed, the |failure_callback| will
   // be invoked with the reason that encryption failed.
   void DecryptMessage(const std::string& app_id,
                       const IncomingMessage& message,
                       const MessageDecryptedCallback& success_callback,
@@ skipping 23 matching lines @@
   scoped_ptr<GCMKeyStore> key_store_;
 
   base::WeakPtrFactory<GCMEncryptionProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMEncryptionProvider);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_CRYPTO_GCM_ENCRYPTION_PROVIDER_H_