Revert of Move base/prefs to components/prefs

components/prefs/pref_registry.cc

-// 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/pref_registry.h"
-
-#include "base/logging.h"
-#include "base/prefs/default_pref_store.h"
-#include "base/prefs/pref_store.h"
-#include "base/stl_util.h"
-#include "base/values.h"
-
-PrefRegistry::PrefRegistry()
-    : defaults_(new DefaultPrefStore()) {
-}
-
-PrefRegistry::~PrefRegistry() {
-}
-
-uint32_t PrefRegistry::GetRegistrationFlags(
-    const std::string& pref_name) const {
-  const auto& it = registration_flags_.find(pref_name);
-  if (it == registration_flags_.end())
-    return NO_REGISTRATION_FLAGS;
-  return it->second;
-}
-
-scoped_refptr<PrefStore> PrefRegistry::defaults() {
-  return defaults_.get();
-}
-
-PrefRegistry::const_iterator PrefRegistry::begin() const {
-  return defaults_->begin();
-}
-
-PrefRegistry::const_iterator PrefRegistry::end() const {
-  return defaults_->end();
-}
-
-void PrefRegistry::SetDefaultPrefValue(const std::string& pref_name,
-                                       base::Value* value) {
-  DCHECK(value);
-  const base::Value* current_value = NULL;
-  DCHECK(defaults_->GetValue(pref_name, &current_value))
-      << "Setting default for unregistered pref: " << pref_name;
-  DCHECK(value->IsType(current_value->GetType()))
-      << "Wrong type for new default: " << pref_name;
-
-  defaults_->ReplaceDefaultValue(pref_name, make_scoped_ptr(value));
-}
-
-void PrefRegistry::RegisterPreference(const std::string& path,
-                                      base::Value* default_value,
-                                      uint32_t flags) {
-  base::Value::Type orig_type = default_value->GetType();
-  DCHECK(orig_type != base::Value::TYPE_NULL &&
-         orig_type != base::Value::TYPE_BINARY) <<
-         "invalid preference type: " << orig_type;
-  DCHECK(!defaults_->GetValue(path, NULL)) <<
-      "Trying to register a previously registered pref: " << path;
-  DCHECK(!ContainsKey(registration_flags_, path)) <<
-      "Trying to register a previously registered pref: " << path;
-
-  defaults_->SetDefaultValue(path, make_scoped_ptr(default_value));
-  if (flags != NO_REGISTRATION_FLAGS)
-    registration_flags_[path] = flags;
-}