Move remaining non-test, non-Chrome-specific Prefs code to base/prefs/.

chrome/browser/extensions/system/system_api.cc

 // Copyright (c) 2012 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/extensions/system/system_api.h"
 
+#include "base/prefs/pref_service.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/event_router_forwarder.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/update_engine_client.h"
 #else
 #include "chrome/browser/upgrade_detector.h"
 #endif
 
@@ skipping 127 matching lines @@
 
 void DispatchScreenUnlockedEvent() {
   DispatchEvent(kOnScreenUnlocked, NULL);
 }
 
 void DispatchWokeUpEvent() {
   DispatchEvent(kOnWokeUp, NULL);
 }
 
 }  // namespace extensions