Revert of Move base/prefs to components/prefs

base/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;
+}