Add a base class for objects that want to filter messages on the UI thread. ...

chrome/browser/service/service_process_control.cc

 // 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.
 
 #include "chrome/browser/service/service_process_control.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/process_util.h"
 #include "base/stl_util-inl.h"
@@ skipping 104 matching lines @@
   }
 
   // Actually going to connect.
   VLOG(1) << "Connecting to Service Process IPC Server";
   // Run the IPC channel on the shared IO thread.
   base::Thread* io_thread = g_browser_process->io_thread();
 
   // TODO(hclam): Handle error connecting to channel.
   const std::string channel_id = GetServiceProcessChannelName();
   channel_.reset(
-      new IPC::SyncChannel(channel_id, IPC::Channel::MODE_CLIENT, this, NULL,
+      new IPC::SyncChannel(channel_id, IPC::Channel::MODE_CLIENT, this,
                            io_thread->message_loop(), true,
                            g_browser_process->shutdown_event()));
   channel_->set_sync_messages_with_no_timeout_allowed(false);
 
   // We just established a channel with the service process. Notify it if an
   // upgrade is available.
   if (Singleton<UpgradeDetector>::get()->notify_upgrade()) {
     Send(new ServiceMsg_UpdateAvailable);
   } else {
     if (registrar_.IsEmpty())
@@ skipping 174 matching lines @@
 }
 
 bool ServiceProcessControl::GetCloudPrintProxyStatus(
     Callback2<bool, std::string>::Type* cloud_print_status_callback) {
   DCHECK(cloud_print_status_callback);
   cloud_print_status_callback_.reset(cloud_print_status_callback);
   return Send(new ServiceMsg_IsCloudPrintProxyEnabled);
 }
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(ServiceProcessControl);