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

chrome/browser/ui/panels/auto_hiding_desktop_bar_win.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/ui/panels/auto_hiding_desktop_bar_win.h"
 
 #include <shellapi.h>
 
 #include "base/logging.h"
 #include "views/widget/monitor_win.h"
@@ skipping 25 matching lines @@
   monitor_ = ::MonitorFromRect(&rect, MONITOR_DEFAULTTOPRIMARY);
   DCHECK(monitor_);
 
   bool taskbar_exists = CheckTaskbars(false);
 
   // If no auto-hiding taskbar exists, we do not need to start the polling
   // timer. If a taskbar is then set to auto-hiding, UpdateWorkArea will be
   // called due to the work area change.
   if (taskbar_exists) {
     if (!polling_timer_.IsRunning()) {
-      polling_timer_.Start(FROM_HERE,
+      polling_timer_.Start(
           base::TimeDelta::FromMilliseconds(kCheckTaskbarPollingIntervalMs),
           this,
           &AutoHidingDesktopBarWin::OnPollingTimer);
     }
   } else {
     if (polling_timer_.IsRunning())
       polling_timer_.Stop();
   }
 }
 
@@ skipping 128 matching lines @@
   if (thickness_changed && notify_observer)
     observer_->OnAutoHidingDesktopBarThicknessChanged();
 
   return true;
 }
 
 // static
 AutoHidingDesktopBar* AutoHidingDesktopBar::Create(Observer* observer) {
   return new AutoHidingDesktopBarWin(observer);
 }