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

chrome/browser/prefs/value_map_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_VALUE_MAP_PREF_STORE_H_
-#define CHROME_BROWSER_PREFS_VALUE_MAP_PREF_STORE_H_
-
-#include <map>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/observer_list.h"
-#include "chrome/browser/prefs/pref_value_map.h"
-#include "chrome/common/pref_store.h"
-
-// A basic PrefStore implementation that uses a simple name-value map for
-// storing the preference values.
-class ValueMapPrefStore : public PrefStore {
- public:
-  typedef std::map<std::string, base::Value*>::iterator iterator;
-  typedef std::map<std::string, base::Value*>::const_iterator const_iterator;
-
-  ValueMapPrefStore();
-
-  // PrefStore overrides:
-  virtual ReadResult GetValue(const std::string& key,
-                              const base::Value** value) const OVERRIDE;
-  virtual void AddObserver(PrefStore::Observer* observer) OVERRIDE;
-  virtual void RemoveObserver(PrefStore::Observer* observer) OVERRIDE;
-  virtual size_t NumberOfObservers() const OVERRIDE;
-
-  iterator begin();
-  iterator end();
-  const_iterator begin() const;
-  const_iterator end() const;
-
- protected:
-  virtual ~ValueMapPrefStore();
-
-  // Store a |value| for |key| in the store. Also generates an notification if
-  // the value changed. Assumes ownership of |value|, which must be non-NULL.
-  void SetValue(const std::string& key, base::Value* value);
-
-  // Remove the value for |key| from the store. Sends a notification if there
-  // was a value to be removed.
-  void RemoveValue(const std::string& key);
-
-  // Notify observers about the initialization completed event.
-  void NotifyInitializationCompleted();
-
- private:
-  PrefValueMap prefs_;
-
-  ObserverList<PrefStore::Observer, true> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(ValueMapPrefStore);
-};
-
-#endif  // CHROME_BROWSER_PREFS_VALUE_MAP_PREF_STORE_H_