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

chrome/browser/prefs/default_pref_store.h

-// 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.
-
-#ifndef CHROME_BROWSER_PREFS_DEFAULT_PREF_STORE_H_
-#define CHROME_BROWSER_PREFS_DEFAULT_PREF_STORE_H_
-
-#include <string>
-
-#include "base/values.h"
-#include "chrome/browser/prefs/value_map_pref_store.h"
-
-// This PrefStore keeps track of default preference values set when a
-// preference is registered with the PrefService.
-class DefaultPrefStore : public ValueMapPrefStore {
- public:
-  DefaultPrefStore();
-
-  // Stores a new |value| for |key|. Assumes ownership of |value|.
-  void SetDefaultValue(const std::string& key, Value* value);
-
-  // Removes the value for |key|.
-  void RemoveDefaultValue(const std::string& key);
-
-  // Returns the registered type for |key| or Value::TYPE_NULL if the |key|
-  // has not been registered.
-  base::Value::Type GetType(const std::string& key) const;
-
- protected:
-  virtual ~DefaultPrefStore();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DefaultPrefStore);
-};
-
-#endif  // CHROME_BROWSER_PREFS_DEFAULT_PREF_STORE_H_