Consolidate EulaAcceptedNotifier implementations.

chrome/browser/metrics/variations/eula_accepted_notifier_mobile.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_mobile.h"
-
-#include "base/bind.h"
-#include "base/prefs/pref_service.h"
-#include "chrome/browser/browser_process.h"
-#include "chrome/common/pref_names.h"
-
-EulaAcceptedNotifierMobile::EulaAcceptedNotifierMobile(
-    PrefService* local_state)
-    : local_state_(local_state) {
-}
-
-EulaAcceptedNotifierMobile::~EulaAcceptedNotifierMobile() {
-}
-
-bool EulaAcceptedNotifierMobile::IsEulaAccepted() {
-  if (local_state_->GetBoolean(prefs::kEulaAccepted))
-    return true;
-
-  // Register for the notification, if this is the first time.
-  if (registrar_.IsEmpty()) {
-    registrar_.Init(local_state_);
-    registrar_.Add(prefs::kEulaAccepted,
-                   base::Bind(&EulaAcceptedNotifierMobile::OnPrefChanged,
-                              base::Unretained(this)));
-  }
-  return false;
-}
-
-void EulaAcceptedNotifierMobile::OnPrefChanged() {
-  DCHECK(!registrar_.IsEmpty());
-  registrar_.RemoveAll();
-
-  DCHECK(local_state_->GetBoolean(prefs::kEulaAccepted));
-  NotifyObserver();
-}
-
-// static
-EulaAcceptedNotifier* EulaAcceptedNotifier::Create() {
-  PrefService* local_state = g_browser_process->local_state();
-  // If the |kEulaAccepted| pref is not registered, return NULL which is
-  // equivalent to not needing to check the EULA. This is the case for some
-  // tests for higher-level classes that use the EulaAcceptNotifier.
-  if (local_state->FindPreference(prefs::kEulaAccepted) == NULL)
-    return NULL;
-  return new EulaAcceptedNotifierMobile(local_state);
-}