Move the bits of Prefs where production code has only trivially easy

chrome/browser/prefs/default_pref_store.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 "chrome/browser/prefs/default_pref_store.h"
-
-using base::Value;
-
-DefaultPrefStore::DefaultPrefStore() {}
-
-void DefaultPrefStore::SetDefaultValue(const std::string& key, Value* value) {
-  CHECK(GetValue(key, NULL) == READ_NO_VALUE);
-  SetValue(key, value);
-}
-
-void DefaultPrefStore::RemoveDefaultValue(const std::string& key) {
-  CHECK(GetValue(key, NULL) == READ_OK);
-  RemoveValue(key);
-}
-
-base::Value::Type DefaultPrefStore::GetType(const std::string& key) const {
-  const Value* value;
-  return GetValue(key, &value) == READ_OK ? value->GetType() : Value::TYPE_NULL;
-}
-
-DefaultPrefStore::~DefaultPrefStore() {}