Revert of Move base/prefs to components/prefs

components/prefs/pref_store_observer_mock.cc

-// Copyright (c) 2011 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_store_observer_mock.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-PrefStoreObserverMock::PrefStoreObserverMock()
-    : initialized(false), initialization_success(false) {}
-
-PrefStoreObserverMock::~PrefStoreObserverMock() {}
-
-void PrefStoreObserverMock::VerifyAndResetChangedKey(
-    const std::string& expected) {
-  EXPECT_EQ(1u, changed_keys.size());
-  if (changed_keys.size() >= 1)
-    EXPECT_EQ(expected, changed_keys.front());
-  changed_keys.clear();
-}
-
-void PrefStoreObserverMock::OnPrefValueChanged(const std::string& key) {
-  changed_keys.push_back(key);
-}
-
-void PrefStoreObserverMock::OnInitializationCompleted(bool success) {
-  initialized = true;
-  initialization_success = success;
-}