Consolidate EulaAcceptedNotifier implementations.

chrome/browser/metrics/variations/eula_accepted_notifier_chromeos.cc

-// Copyright (c) 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 "chrome/browser/metrics/variations/eula_accepted_notifier_chromeos.h"
-
-#include "base/logging.h"
-#include "chrome/browser/chromeos/login/startup_utils.h"
-#include "chrome/common/chrome_notification_types.h"
-#include "content/public/browser/notification_service.h"
-
-EulaAcceptedNotifierChromeos::EulaAcceptedNotifierChromeos() {
-}
-
-EulaAcceptedNotifierChromeos::~EulaAcceptedNotifierChromeos() {
-}
-
-bool EulaAcceptedNotifierChromeos::IsEulaAccepted() {
-  if (chromeos::StartupUtils::IsEulaAccepted())
-    return true;
-
-  // Register for the notification, if this is the first time.
-  if (registrar_.IsEmpty()) {
-    // Note that this must listen on AllSources due to the difficulty in knowing
-    // when the WizardController instance is created, and to avoid over-coupling
-    // the Chrome OS code with the VariationsService by directly attaching as an
-    // observer. This is OK because WizardController is essentially a singleton.
-    registrar_.Add(this, chrome::NOTIFICATION_WIZARD_EULA_ACCEPTED,
-                   content::NotificationService::AllSources());
-  }
-  return false;
-}
-
-void EulaAcceptedNotifierChromeos::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  DCHECK_EQ(chrome::NOTIFICATION_WIZARD_EULA_ACCEPTED, type);
-  // This should only ever be received once. Remove it after this call.
-  DCHECK(!registrar_.IsEmpty());
-  registrar_.Remove(this, chrome::NOTIFICATION_WIZARD_EULA_ACCEPTED,
-                    content::NotificationService::AllSources());
-
-  NotifyObserver();
-}
-
-// static
-EulaAcceptedNotifier* EulaAcceptedNotifier::Create() {
-#if defined(GOOGLE_CHROME_BUILD)
-  return new EulaAcceptedNotifierChromeos;
-#else
-  return NULL;
-#endif
-}