Revert "FBTF: Allow forward declaration of classes passed to sync IPC messages."

ipc/ipc_message_utils_impl.h

 // Copyright (c) 2010 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.
 //
 // This file contains templates forward declared (but not defined) in
 // ipc_message_utils.h so that they are only instantiated in certain files,
 // notably ipc_message_impl_macros.h and a few IPC unit tests.
 
 #ifndef IPC_IPC_MESSAGE_UTILS_IMPL_H_
 #define IPC_IPC_MESSAGE_UTILS_IMPL_H_
 
 namespace IPC {
 
 template <class ParamType>
 MessageWithTuple<ParamType>::MessageWithTuple(
     int32 routing_id, uint32 type, const RefParam& p)
     : Message(routing_id, type, PRIORITY_NORMAL) {
   WriteParam(this, p);
 }
 
 // TODO(erg): Migrate MessageWithTuple<ParamType>::Read() here once I figure
 // out why having the definition here doesn't export the symbols.
 
 // We can't migrate the template for Log() to MessageWithTuple, because each
 // subclass needs to have Log() to call Read(), which instantiates the above
 // template.
 
-template <class SendParamType, class ReplyParamType>
-MessageWithReply<SendParamType, ReplyParamType>::MessageWithReply(
-    int32 routing_id, uint32 type,
-    const RefSendParam& send,
-    const ReplyParam& reply)
-    : SyncMessage(routing_id, type, PRIORITY_NORMAL,
-                  new ParamDeserializer<ReplyParam>(reply)) {
-  WriteParam(this, send);
-}
-
-// TODO(erg): Migrate ReadSendParam()/ReadReplyParam() here when we can force
-// the visibility/linkage.
-
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_IMPL_H_