Revert of Move base/prefs to components/prefs

components/prefs/default_pref_store.cc

Index: components/prefs/default_pref_store.cc
diff --git a/components/prefs/default_pref_store.cc b/components/prefs/default_pref_store.cc
deleted file mode 100644
index b08ef7a52866d221ec89a98adef2d8864605b625..0000000000000000000000000000000000000000
--- a/components/prefs/default_pref_store.cc
+++ /dev/null
@@ -1,56 +0,0 @@
-// 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/default_pref_store.h"
-
-#include <utility>
-
-#include "base/logging.h"
-
-using base::Value;
-
-DefaultPrefStore::DefaultPrefStore() {}
-
-bool DefaultPrefStore::GetValue(const std::string& key,
-                                const Value** result) const {
-  return prefs_.GetValue(key, result);
-}
-
-void DefaultPrefStore::AddObserver(PrefStore::Observer* observer) {
-  observers_.AddObserver(observer);
-}
-
-void DefaultPrefStore::RemoveObserver(PrefStore::Observer* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-bool DefaultPrefStore::HasObservers() const {
-  return observers_.might_have_observers();
-}
-
-void DefaultPrefStore::SetDefaultValue(const std::string& key,
-                                       scoped_ptr<Value> value) {
-  DCHECK(!GetValue(key, NULL));
-  prefs_.SetValue(key, std::move(value));
-}
-
-void DefaultPrefStore::ReplaceDefaultValue(const std::string& key,
-                                           scoped_ptr<Value> value) {
-  const Value* old_value = NULL;
-  GetValue(key, &old_value);
-  bool notify = !old_value->Equals(value.get());
-  prefs_.SetValue(key, std::move(value));
-  if (notify)
-    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
-}
-
-DefaultPrefStore::const_iterator DefaultPrefStore::begin() const {
-  return prefs_.begin();
-}
-
-DefaultPrefStore::const_iterator DefaultPrefStore::end() const {
-  return prefs_.end();
-}
-
-DefaultPrefStore::~DefaultPrefStore() {}