Revert "Allow MessageFilters to restrict listening to specific message classes"

chrome/browser/media/cast_transport_host_filter.cc

 // 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.
 
 #include "chrome/browser/media/cast_transport_host_filter.h"
 #include "media/cast/transport/cast_transport_sender.h"
 
 namespace cast {
 
-CastTransportHostFilter::CastTransportHostFilter()
-    : BrowserMessageFilter(CastMsgStart) {
+CastTransportHostFilter::CastTransportHostFilter() {
 }
 
 CastTransportHostFilter::~CastTransportHostFilter() {
 }
 
 bool CastTransportHostFilter::OnMessageReceived(const IPC::Message& message,
                                                 bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(CastTransportHostFilter, message, *message_was_ok)
     IPC_MESSAGE_HANDLER(CastHostMsg_New, OnNew)
@@ skipping 142 matching lines @@
       id_map_.Lookup(channel_id);
   if (sender) {
     sender->ResendPackets(is_audio, missing_packets);
   } else {
     DVLOG(1)
         << "CastTransportHostFilter::OnResendPackets on non-existing channel";
   }
 }
 
 }  // namespace cast