Renamed DefaultPrefStore into InMemoryPrefStore because it can be used in further contexts.

chrome/browser/prefs/default_pref_store.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/browser/prefs/default_pref_store.h"
-
-#include "base/values.h"
-
-DefaultPrefStore::DefaultPrefStore() : prefs_(new DictionaryValue()) {
-}
-
-DefaultPrefStore::~DefaultPrefStore() {
-}
-
-DictionaryValue* DefaultPrefStore::prefs() const {
-  return prefs_.get();
-}
-
-PrefStore::PrefReadError DefaultPrefStore::ReadPrefs() {
-  return PrefStore::PREF_READ_ERROR_NONE;
-}