Extensions: Move cast_channel and hid APIs to extensions/.

chrome/browser/extensions/api/cast_channel/cast_auth_util_openssl.cc

-// 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 "chrome/browser/extensions/api/cast_channel/cast_auth_util.h"
-
-#include "base/logging.h"
-
-namespace extensions {
-namespace api {
-namespace cast_channel {
-
-bool AuthenticateChallengeReply(const CastMessage& challenge_reply,
-                                const std::string& peer_cert) {
-  NOTREACHED();
-  return false;
-}
-
-}  // namespace cast_channel
-}  // namespace api
-}  // namespace extensions