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

chrome/browser/chromeos/login/screen_locker.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.
 
 #include "chrome/browser/chromeos/login/screen_locker.h"
 
 #include <X11/extensions/XTest.h>
 #include <X11/keysym.h>
 #include <gdk/gdkkeysyms.h>
 #include <gdk/gdkx.h>
@@ skipping 657 matching lines @@
 };
 
 // A event observer used to show the screen locker upon
 // user action: mouse or keyboard interactions.
 // TODO(oshima): this has to be disabled while authenticating.
 class LockerInputEventObserver : public MessageLoopForUI::Observer {
  public:
   explicit LockerInputEventObserver(ScreenLocker* screen_locker)
       : screen_locker_(screen_locker),
         ALLOW_THIS_IN_INITIALIZER_LIST(
-            timer_(FROM_HERE,
-                   base::TimeDelta::FromSeconds(kScreenSaverIdleTimeout), this,
+            timer_(base::TimeDelta::FromSeconds(kScreenSaverIdleTimeout), this,
                    &LockerInputEventObserver::StartScreenSaver)) {
   }
 
   virtual void WillProcessEvent(GdkEvent* event) OVERRIDE {
     if ((event->type == GDK_KEY_PRESS ||
          event->type == GDK_BUTTON_PRESS ||
          event->type == GDK_MOTION_NOTIFY)) {
       timer_.Reset();
       screen_locker_->StopScreenSaver();
     }
@@ skipping 540 matching lines @@
 
 bool ScreenLocker::AcceleratorPressed(const views::Accelerator& accelerator) {
   if (!background_view_->IsScreenSaverVisible()) {
     StartScreenSaver();
     return true;
   }
   return false;
 }
 
 }  // namespace chromeos