[cast_channel] Move cast_channel related files from //extensions to //components

components/cast_channel/cast_message_util.h

 // Copyright 2014 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.
 
-#ifndef EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_MESSAGE_UTIL_H_
-#define EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_MESSAGE_UTIL_H_
+#ifndef COMPONENTS_CAST_CHANNEL_CAST_MESSAGE_UTIL_H_
+#define COMPONENTS_CAST_CHANNEL_CAST_MESSAGE_UTIL_H_
 
 #include <string>
 
-namespace extensions {
-namespace api {
 namespace cast_channel {
 
 class AuthContext;
 class CastMessage;
 class DeviceAuthMessage;
-struct MessageInfo;
-
-// Fills |message_proto| from |message| and returns true on success.
-bool MessageInfoToCastMessage(const MessageInfo& message,
-                              CastMessage* message_proto);
 
 // Checks if the contents of |message_proto| are valid.
 bool IsCastMessageValid(const CastMessage& message_proto);
 
-// Fills |message| from |message_proto| and returns true on success.
-bool CastMessageToMessageInfo(const CastMessage& message_proto,
-                              MessageInfo* message);
-
 // Returns a human readable string for |message_proto|.
 std::string CastMessageToString(const CastMessage& message_proto);
 
 // Returns a human readable string for |message|.
 std::string AuthMessageToString(const DeviceAuthMessage& message);
 
 // Fills |message_proto| appropriately for an auth challenge request message.
 // Uses the nonce challenge in |auth_context|.
 void CreateAuthChallengeMessage(CastMessage* message_proto,
                                 const AuthContext& auth_context);
 
 // Returns whether the given message is an auth handshake message.
 bool IsAuthMessage(const CastMessage& message);
 
 }  // namespace cast_channel
-}  // namespace api
-}  // namespace extensions
 
-#endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_MESSAGE_UTIL_H_
+#endif  // COMPONENTS_CAST_CHANNEL_CAST_MESSAGE_UTIL_H_