Revert of Move base/prefs to components/prefs

components/prefs/pref_notifier_impl.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 "base/prefs/pref_notifier_impl.h"
-
-#include "base/logging.h"
-#include "base/prefs/pref_service.h"
-#include "base/stl_util.h"
-
-PrefNotifierImpl::PrefNotifierImpl()
-    : pref_service_(NULL) {
-}
-
-PrefNotifierImpl::PrefNotifierImpl(PrefService* service)
-    : pref_service_(service) {
-}
-
-PrefNotifierImpl::~PrefNotifierImpl() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-
-  // Verify that there are no pref observers when we shut down.
-  for (PrefObserverMap::iterator it = pref_observers_.begin();
-       it != pref_observers_.end(); ++it) {
-    PrefObserverList::Iterator obs_iterator(it->second);
-    if (obs_iterator.GetNext()) {
-      LOG(WARNING) << "pref observer found at shutdown " << it->first;
-    }
-  }
-
-  // Same for initialization observers.
-  if (!init_observers_.empty())
-    LOG(WARNING) << "Init observer found at shutdown.";
-
-  STLDeleteContainerPairSecondPointers(pref_observers_.begin(),
-                                       pref_observers_.end());
-  pref_observers_.clear();
-  init_observers_.clear();
-}
-
-void PrefNotifierImpl::AddPrefObserver(const std::string& path,
-                                       PrefObserver* obs) {
-  // Get the pref observer list associated with the path.
-  PrefObserverList* observer_list = NULL;
-  const PrefObserverMap::iterator observer_iterator =
-      pref_observers_.find(path);
-  if (observer_iterator == pref_observers_.end()) {
-    observer_list = new PrefObserverList;
-    pref_observers_[path] = observer_list;
-  } else {
-    observer_list = observer_iterator->second;
-  }
-
-  // Add the pref observer. ObserverList will DCHECK if it already is
-  // in the list.
-  observer_list->AddObserver(obs);
-}
-
-void PrefNotifierImpl::RemovePrefObserver(const std::string& path,
-                                          PrefObserver* obs) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-
-  const PrefObserverMap::iterator observer_iterator =
-      pref_observers_.find(path);
-  if (observer_iterator == pref_observers_.end()) {
-    return;
-  }
-
-  PrefObserverList* observer_list = observer_iterator->second;
-  observer_list->RemoveObserver(obs);
-}
-
-void PrefNotifierImpl::AddInitObserver(base::Callback<void(bool)> obs) {
-  init_observers_.push_back(obs);
-}
-
-void PrefNotifierImpl::OnPreferenceChanged(const std::string& path) {
-  FireObservers(path);
-}
-
-void PrefNotifierImpl::OnInitializationCompleted(bool succeeded) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-
-  // We must make a copy of init_observers_ and clear it before we run
-  // observers, or we can end up in this method re-entrantly before
-  // clearing the observers list.
-  PrefInitObserverList observers(init_observers_);
-  init_observers_.clear();
-
-  for (PrefInitObserverList::iterator it = observers.begin();
-       it != observers.end();
-       ++it) {
-    it->Run(succeeded);
-  }
-}
-
-void PrefNotifierImpl::FireObservers(const std::string& path) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-
-  // Only send notifications for registered preferences.
-  if (!pref_service_->FindPreference(path))
-    return;
-
-  const PrefObserverMap::iterator observer_iterator =
-      pref_observers_.find(path);
-  if (observer_iterator == pref_observers_.end())
-    return;
-
-  FOR_EACH_OBSERVER(PrefObserver,
-                    *(observer_iterator->second),
-                    OnPreferenceChanged(pref_service_, path));
-}
-
-void PrefNotifierImpl::SetPrefService(PrefService* pref_service) {
-  DCHECK(pref_service_ == NULL);
-  pref_service_ = pref_service;
-}