Revert of Delete base/prefs and update callers to use components.

ash/system/chromeos/power/power_event_observer.cc

 // Copyright 2013 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 "ash/system/chromeos/power/power_event_observer.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/wm/power_button_controller.h"
+#include "base/prefs/pref_service.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
-#include "components/prefs/pref_service.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/user_activity/user_activity_detector.h"
 #include "ui/compositor/compositor.h"
 #include "ui/display/chromeos/display_configurator.h"
 
 namespace ash {
 
 namespace {
 
@@ skipping 125 matching lines @@
   } else {
     VLOG(1) << "Screen locked without suspend";
   }
 }
 
 void PowerEventObserver::ScreenIsUnlocked() {
   screen_locked_ = false;
 }
 
 }  // namespace ash