Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

content/browser/renderer_host/p2p/socket_dispatcher_host.cc

 // Copyright (c) 2012 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/p2p/socket_dispatcher_host.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/p2p/socket_host.h"
 #include "content/common/p2p_messages.h"
@@ skipping 142 matching lines @@
 
   if (monitoring_networks_)
     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 }
 
 P2PSocketHost* P2PSocketDispatcherHost::LookupSocket(int socket_id) {
   SocketsMap::iterator it = sockets_.find(socket_id);
   return (it == sockets_.end()) ? NULL : it->second;
 }
 
-void P2PSocketDispatcherHost::OnStartNetworkNotifications(
-    const IPC::Message& msg) {
+void P2PSocketDispatcherHost::OnStartNetworkNotifications() {
   if (!monitoring_networks_) {
     net::NetworkChangeNotifier::AddIPAddressObserver(this);
     monitoring_networks_ = true;
   }
 
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE, base::Bind(
           &P2PSocketDispatcherHost::DoGetNetworkList, this));
 }
 
-void P2PSocketDispatcherHost::OnStopNetworkNotifications(
-    const IPC::Message& msg) {
+void P2PSocketDispatcherHost::OnStopNetworkNotifications() {
   if (monitoring_networks_) {
     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
     monitoring_networks_ = false;
   }
 }
 
 void P2PSocketDispatcherHost::OnGetHostAddress(const std::string& host_name,
                                                int32 request_id) {
   DnsRequest* request = new DnsRequest(request_id,
                                        resource_context_->GetHostResolver());
@@ skipping 104 matching lines @@
 void P2PSocketDispatcherHost::OnAddressResolved(
     DnsRequest* request,
     const net::IPAddressList& addresses) {
   Send(new P2PMsg_GetHostAddressResult(request->request_id(), addresses));
 
   dns_requests_.erase(request);
   delete request;
 }
 
 }  // namespace content