Cast: Added support for AES-CTR crypto.

media/cast/test/crypto_utility.h

 // Copyright 2013 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 "media/cast/rtp_common/mock_rtp_payload_feedback.h"
+// Utility functions for crypto testing.
+
+#include "media/cast/cast_config.h"
 
 namespace media {
 namespace cast {
 
-MockRtpPayloadFeedback::MockRtpPayloadFeedback() {
-}
-
-MockRtpPayloadFeedback::~MockRtpPayloadFeedback() {
-}
+// Convert to a binary string from a base 16 string.
+std::string ConvertFromBase16String(const std::string base_16);
 
 }  // namespace cast
 }  // namespace media
+