Revert "Currently, base/timer.cc calls PostTask with FROM_HERE as the Location,

chrome/browser/process_singleton_linux.cc

 // Copyright (c) 2011 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 452 matching lines @@
     SocketReader(ProcessSingleton::LinuxWatcher* parent,
                  MessageLoop* ui_message_loop,
                  int fd)
         : parent_(parent),
           ui_message_loop_(ui_message_loop),
           fd_(fd),
           bytes_read_(0) {
       // Wait for reads.
       MessageLoopForIO::current()->WatchFileDescriptor(
           fd, true, MessageLoopForIO::WATCH_READ, &fd_reader_, this);
-      timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(kTimeoutInSeconds),
+      timer_.Start(base::TimeDelta::FromSeconds(kTimeoutInSeconds),
                    this, &SocketReader::OnTimerExpiry);
     }
 
     virtual ~SocketReader() {
       CloseSocket(fd_);
     }
 
     // MessageLoopForIO::Watcher impl.
     virtual void OnFileCanReadWithoutBlocking(int fd);
     virtual void OnFileCanWriteWithoutBlocking(int fd) {
@@ skipping 497 matching lines @@
     sock));
 
   return true;
 }
 
 void ProcessSingleton::Cleanup() {
   UnlinkPath(socket_path_);
   UnlinkPath(cookie_path_);
   UnlinkPath(lock_path_);
 }