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

chrome/browser/chromeos/login/screen_locker.cc

Index: chrome/browser/chromeos/login/screen_locker.cc
diff --git a/chrome/browser/chromeos/login/screen_locker.cc b/chrome/browser/chromeos/login/screen_locker.cc
index b9d40f9f5e661bc572dd23231ab3c54a11c87356..fe1616ba987f6239fb477e7ebf1c6c2abdb65319 100644
--- a/chrome/browser/chromeos/login/screen_locker.cc
+++ b/chrome/browser/chromeos/login/screen_locker.cc
@@ -675,8 +675,7 @@ class LockerInputEventObserver : public MessageLoopForUI::Observer {
   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)) {
   }