Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/prefs/pref_registry.cc

Index: chrome/browser/prefs/pref_registry.cc
diff --git a/chrome/browser/prefs/pref_registry.cc b/chrome/browser/prefs/pref_registry.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c91aa8346bbbe13f52edd3d11865e2ef4e0e7de8
--- /dev/null
+++ b/chrome/browser/prefs/pref_registry.cc
@@ -0,0 +1,64 @@
+// 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 "chrome/browser/prefs/pref_registry.h"
+
+#include "base/logging.h"
+#include "base/prefs/default_pref_store.h"
+#include "base/prefs/pref_store.h"
+#include "base/values.h"
+
+PrefRegistry::PrefRegistry()
+    : defaults_(new DefaultPrefStore()) {
+}
+
+PrefRegistry::~PrefRegistry() {
+}
+
+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::SetRegistrationCallback(
+    const RegistrationCallback& callback) {
+  registration_callback_ = callback;
+}
+
+void PrefRegistry::SetUnregistrationCallback(
+    const UnregistrationCallback& callback) {
+  unregistration_callback_ = callback;
+}
+
+void PrefRegistry::DeprecatedUnregisterPreference(const char* path) {
+  DCHECK(defaults_->GetValue(path, NULL)) <<
+      "Trying to unregister an unregistered pref: " << path;
+
+  defaults_->RemoveDefaultValue(path);
+
+  if (!unregistration_callback_.is_null())
+    unregistration_callback_.Run(path);
+}
+
+void PrefRegistry::RegisterPreference(const char* path,
+                                      base::Value* default_value) {
+  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;
+
+  defaults_->SetDefaultValue(path, default_value);
+
+  if (!registration_callback_.is_null())
+    registration_callback_.Run(path, default_value);
+}