Revert "Revert "Const-ify RefCountedThreadSafe::AddRef and Release.""

ipc/ipc_channel_proxy.cc

 // Copyright (c) 2006-2008 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 "base/message_loop.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/thread.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_logging.h"
@@ skipping 36 matching lines @@
 void ChannelProxy::MessageFilter::OnChannelConnected(int32 peer_pid) {}
 
 void ChannelProxy::MessageFilter::OnChannelError() {}
 
 void ChannelProxy::MessageFilter::OnChannelClosing() {}
 
 bool ChannelProxy::MessageFilter::OnMessageReceived(const Message& message) {
   return false;
 }
 
-void ChannelProxy::MessageFilter::OnDestruct() {
+void ChannelProxy::MessageFilter::OnDestruct() const {
   delete this;
 }
 
 //------------------------------------------------------------------------------
 
 ChannelProxy::Context::Context(Channel::Listener* listener,
                                MessageFilter* filter,
                                MessageLoop* ipc_message_loop)
     : listener_message_loop_(MessageLoop::current()),
       listener_(listener),
@@ skipping 273 matching lines @@
 int ChannelProxy::GetClientFileDescriptor() const {
   Channel *channel = context_.get()->channel_;
   DCHECK(channel); // Channel must have been created first.
   return channel->GetClientFileDescriptor();
 }
 #endif
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC