Remove associated keying material when unregistering from GCM

components/gcm_driver/crypto/gcm_encryption_provider.h

Index: components/gcm_driver/crypto/gcm_encryption_provider.h
diff --git a/components/gcm_driver/crypto/gcm_encryption_provider.h b/components/gcm_driver/crypto/gcm_encryption_provider.h
index 9eec22cd9063c0060f279607879e9a30f76df134..8c2c41b17513d9e1fee47640c384755dd782f183 100644
--- a/components/gcm_driver/crypto/gcm_encryption_provider.h
+++ b/components/gcm_driver/crypto/gcm_encryption_provider.h
@@ -76,6 +76,11 @@ class GCMEncryptionProvider {
   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;