Revert of Move base/prefs to components/prefs

components/prefs/pref_change_registrar.cc

-// Copyright (c) 2010 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 "base/prefs/pref_change_registrar.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/prefs/pref_service.h"
-
-PrefChangeRegistrar::PrefChangeRegistrar() : service_(NULL) {}
-
-PrefChangeRegistrar::~PrefChangeRegistrar() {
-  // If you see an invalid memory access in this destructor, this
-  // PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
-  // has been destroyed. This should not happen any more but be warned.
-  // Feel free to contact battre@chromium.org in case this happens.
-  RemoveAll();
-}
-
-void PrefChangeRegistrar::Init(PrefService* service) {
-  DCHECK(IsEmpty() || service_ == service);
-  service_ = service;
-}
-
-void PrefChangeRegistrar::Add(const std::string& path,
-                              const base::Closure& obs) {
-  Add(path, base::Bind(&PrefChangeRegistrar::InvokeUnnamedCallback, obs));
-}
-
-void PrefChangeRegistrar::Add(const std::string& path,
-                              const NamedChangeCallback& obs) {
-  if (!service_) {
-    NOTREACHED();
-    return;
-  }
-  DCHECK(!IsObserved(path)) << "Already had this pref registered.";
-
-  service_->AddPrefObserver(path, this);
-  observers_[path] = obs;
-}
-
-void PrefChangeRegistrar::Remove(const std::string& path) {
-  DCHECK(IsObserved(path));
-
-  observers_.erase(path);
-  service_->RemovePrefObserver(path, this);
-}
-
-void PrefChangeRegistrar::RemoveAll() {
-  for (ObserverMap::const_iterator it = observers_.begin();
-       it != observers_.end(); ++it) {
-    service_->RemovePrefObserver(it->first, this);
-  }
-
-  observers_.clear();
-}
-
-bool PrefChangeRegistrar::IsEmpty() const {
-  return observers_.empty();
-}
-
-bool PrefChangeRegistrar::IsObserved(const std::string& pref) {
-  return observers_.find(pref) != observers_.end();
-}
-
-bool PrefChangeRegistrar::IsManaged() {
-  for (ObserverMap::const_iterator it = observers_.begin();
-       it != observers_.end(); ++it) {
-    const PrefService::Preference* pref = service_->FindPreference(it->first);
-    if (pref && pref->IsManaged())
-      return true;
-  }
-  return false;
-}
-
-void PrefChangeRegistrar::OnPreferenceChanged(PrefService* service,
-                                              const std::string& pref) {
-  if (IsObserved(pref))
-    observers_[pref].Run(pref);
-}
-
-void PrefChangeRegistrar::InvokeUnnamedCallback(const base::Closure& callback,
-                                                const std::string& pref_name) {
-  callback.Run();
-}
-
-PrefService* PrefChangeRegistrar::prefs() {
-  return service_;
-}
-
-const PrefService* PrefChangeRegistrar::prefs() const {
-  return service_;
-}