Clean up pref change notification handling.

chrome/common/pref_store_base.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 "chrome/common/pref_store_base.h"
+
+void PrefStoreBase::AddObserver(PrefStore::ObserverInterface* observer) {
+  observers_.AddObserver(observer);
+}
+
+void PrefStoreBase::RemoveObserver(PrefStore::ObserverInterface* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void PrefStoreBase::NotifyPrefValueChanged(const std::string& key) {
+  FOR_EACH_OBSERVER(ObserverInterface, observers_, OnPrefValueChanged(key));
+}
+
+void PrefStoreBase::NotifyInitializationCompleted() {
+  FOR_EACH_OBSERVER(ObserverInterface, observers_, OnInitializationCompleted());
+}