Revert of Move base/prefs to components/prefs

base/prefs/value_map_pref_store.cc

Index: base/prefs/value_map_pref_store.cc
diff --git a/base/prefs/value_map_pref_store.cc b/base/prefs/value_map_pref_store.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fdb087fc9ec2209bcdb3a07226ba11542be0ee8d
--- /dev/null
+++ b/base/prefs/value_map_pref_store.cc
@@ -0,0 +1,64 @@
+// 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/value_map_pref_store.h"
+
+#include <algorithm>
+#include <utility>
+
+#include "base/stl_util.h"
+#include "base/values.h"
+
+ValueMapPrefStore::ValueMapPrefStore() {}
+
+bool ValueMapPrefStore::GetValue(const std::string& key,
+                                 const base::Value** value) const {
+  return prefs_.GetValue(key, value);
+}
+
+void ValueMapPrefStore::AddObserver(PrefStore::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ValueMapPrefStore::RemoveObserver(PrefStore::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+bool ValueMapPrefStore::HasObservers() const {
+  return observers_.might_have_observers();
+}
+
+void ValueMapPrefStore::SetValue(const std::string& key,
+                                 scoped_ptr<base::Value> value,
+                                 uint32_t flags) {
+  if (prefs_.SetValue(key, std::move(value)))
+    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+}
+
+void ValueMapPrefStore::RemoveValue(const std::string& key, uint32_t flags) {
+  if (prefs_.RemoveValue(key))
+    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+}
+
+bool ValueMapPrefStore::GetMutableValue(const std::string& key,
+                                        base::Value** value) {
+  return prefs_.GetValue(key, value);
+}
+
+void ValueMapPrefStore::ReportValueChanged(const std::string& key,
+                                           uint32_t flags) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+}
+
+void ValueMapPrefStore::SetValueSilently(const std::string& key,
+                                         scoped_ptr<base::Value> value,
+                                         uint32_t flags) {
+  prefs_.SetValue(key, std::move(value));
+}
+
+ValueMapPrefStore::~ValueMapPrefStore() {}
+
+void ValueMapPrefStore::NotifyInitializationCompleted() {
+  FOR_EACH_OBSERVER(Observer, observers_, OnInitializationCompleted(true));
+}