Extensions: Move cast_channel and hid APIs to extensions/.

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