Remove associated keying material when unregistering from GCM

components/gcm_driver/crypto/gcm_encryption_provider.cc

 // 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.
 
 #include "components/gcm_driver/crypto/gcm_encryption_provider.h"
 
 #include <vector>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 64 matching lines @@
 
 void GCMEncryptionProvider::GetEncryptionInfo(
     const std::string& app_id,
     const EncryptionInfoCallback& callback) {
   DCHECK(key_store_);
   key_store_->GetKeys(
       app_id, base::Bind(&GCMEncryptionProvider::DidGetEncryptionInfo,
                          weak_ptr_factory_.GetWeakPtr(), app_id, callback));
 }
 
+void GCMEncryptionProvider::RemoveEncryptionInfo(
+    const std::string& app_id,
+    const base::Closure& callback) {
+  DCHECK(key_store_);
+  key_store_->RemoveKeys(app_id, callback);
+}
+
 bool GCMEncryptionProvider::IsEncryptedMessage(const IncomingMessage& message)
     const {
   // The Web Push protocol requires the encryption and crypto-key properties to
   // be set, and the raw_data field to be populated with the payload.
   if (message.data.find(kEncryptionProperty) == message.data.end() ||
       message.data.find(kCryptoKeyProperty) == message.data.end())
     return false;
 
   return message.raw_data.size() > 0;
 }
@@ skipping 125 matching lines @@
   decrypted_message.decrypted = true;
 
   // There must be no data associated with the decrypted message at this point,
   // to make sure that we don't end up in an infinite decryption loop.
   DCHECK_EQ(0u, decrypted_message.data.size());
 
   success_callback.Run(decrypted_message);
 }
 
 }  // namespace gcm