Make BrowserMessageFilter not derive from IPC::ChannelProxy::MessageFilter. This allows us to hide …

content/browser/renderer_host/media/midi_host.cc

 // Copyright (c) 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 "content/browser/renderer_host/media/midi_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/process/process.h"
@@ skipping 28 matching lines @@
       midi_manager_(midi_manager),
       sent_bytes_in_flight_(0),
       bytes_sent_since_last_acknowledgement_(0) {
 }
 
 MIDIHost::~MIDIHost() {
   if (midi_manager_)
     midi_manager_->EndSession(this);
 }
 
-void MIDIHost::OnChannelClosing() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  BrowserMessageFilter::OnChannelClosing();
-}
-
 void MIDIHost::OnDestruct() const {
   BrowserThread::DeleteOnIOThread::Destruct(this);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // IPC Messages handler
 bool MIDIHost::OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(MIDIHost, message, *message_was_ok)
@@ skipping 100 matching lines @@
 
   if (bytes_sent_since_last_acknowledgement_ >=
       kAcknowledgementThresholdBytes) {
     Send(new MIDIMsg_AcknowledgeSentData(
         bytes_sent_since_last_acknowledgement_));
     bytes_sent_since_last_acknowledgement_ = 0;
   }
 }
 
 }  // namespace content