Simplify threading in browser thread by making only ChromeThread deal with di...

chrome/browser/process_singleton_linux.cc

 // Copyright (c) 2009 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.
 
 // On Linux, when the user tries to launch a second copy of chrome, we check
 // for a socket in the user's profile directory.  If the socket file is open we
 // send a message to the first chrome browser process with the current
 // directory and second process command line flags.  The second process then
 // exits.
 //
@@ skipping 448 matching lines @@
   }
   int rv = SetNonBlocking(connection_socket);
   DCHECK_EQ(0, rv) << "Failed to make non-blocking socket.";
   SocketReader* reader = new SocketReader(this,
                                           ui_message_loop_,
                                           connection_socket);
   readers_.insert(reader);
 }
 
 void ProcessSingleton::LinuxWatcher::StartListening(int socket) {
-  DCHECK(ChromeThread::GetMessageLoop(ChromeThread::IO) ==
-         MessageLoop::current());
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
   // Watch for client connections on this socket.
   MessageLoopForIO* ml = MessageLoopForIO::current();
   ml->AddDestructionObserver(this);
   ml->WatchFileDescriptor(socket, true, MessageLoopForIO::WATCH_READ,
                           &fd_watcher_, this);
 }
 
 void ProcessSingleton::LinuxWatcher::HandleMessage(
     const std::string& current_dir, const std::vector<std::string>& argv,
     SocketReader* reader) {
@@ skipping 284 matching lines @@
   DCHECK(ml);
   ml->PostTask(FROM_HERE, NewRunnableMethod(
     watcher_.get(),
     &ProcessSingleton::LinuxWatcher::StartListening,
     sock));
 }
 
 void ProcessSingleton::Cleanup() {
   UnlinkPath(lock_path_.value());
 }