Revert of Move base/prefs to components/prefs

components/prefs/overlay_user_pref_store.h

Index: components/prefs/overlay_user_pref_store.h
diff --git a/components/prefs/overlay_user_pref_store.h b/components/prefs/overlay_user_pref_store.h
deleted file mode 100644
index 35ada57123f785e79b8ad099481e5538e4f90552..0000000000000000000000000000000000000000
--- a/components/prefs/overlay_user_pref_store.h
+++ /dev/null
@@ -1,89 +0,0 @@
-// 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 BASE_PREFS_OVERLAY_USER_PREF_STORE_H_
-#define BASE_PREFS_OVERLAY_USER_PREF_STORE_H_
-
-#include <stdint.h>
-
-#include <map>
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/observer_list.h"
-#include "base/prefs/base_prefs_export.h"
-#include "base/prefs/persistent_pref_store.h"
-#include "base/prefs/pref_value_map.h"
-
-// PersistentPrefStore that directs all write operations into an in-memory
-// PrefValueMap. Read operations are first answered by the PrefValueMap.
-// If the PrefValueMap does not contain a value for the requested key,
-// the look-up is passed on to an underlying PersistentPrefStore |underlay_|.
-class BASE_PREFS_EXPORT OverlayUserPrefStore : public PersistentPrefStore,
-                                               public PrefStore::Observer {
- public:
-  explicit OverlayUserPrefStore(PersistentPrefStore* underlay);
-
-  // Returns true if a value has been set for the |key| in this
-  // OverlayUserPrefStore, i.e. if it potentially overrides a value
-  // from the |underlay_|.
-  virtual bool IsSetInOverlay(const std::string& key) const;
-
-  // Methods of PrefStore.
-  void AddObserver(PrefStore::Observer* observer) override;
-  void RemoveObserver(PrefStore::Observer* observer) override;
-  bool HasObservers() const override;
-  bool IsInitializationComplete() const override;
-  bool GetValue(const std::string& key,
-                const base::Value** result) const override;
-
-  // Methods of PersistentPrefStore.
-  bool GetMutableValue(const std::string& key, base::Value** result) override;
-  void SetValue(const std::string& key,
-                scoped_ptr<base::Value> value,
-                uint32_t flags) override;
-  void SetValueSilently(const std::string& key,
-                        scoped_ptr<base::Value> value,
-                        uint32_t flags) override;
-  void RemoveValue(const std::string& key, uint32_t flags) override;
-  bool ReadOnly() const override;
-  PrefReadError GetReadError() const override;
-  PrefReadError ReadPrefs() override;
-  void ReadPrefsAsync(ReadErrorDelegate* delegate) override;
-  void CommitPendingWrite() override;
-  void SchedulePendingLossyWrites() override;
-  void ReportValueChanged(const std::string& key, uint32_t flags) override;
-
-  // Methods of PrefStore::Observer.
-  void OnPrefValueChanged(const std::string& key) override;
-  void OnInitializationCompleted(bool succeeded) override;
-
-  void RegisterOverlayPref(const std::string& key);
-  void RegisterOverlayPref(const std::string& overlay_key,
-                           const std::string& underlay_key);
-
- protected:
-  ~OverlayUserPrefStore() override;
-
- private:
-  typedef std::map<std::string, std::string> NamesMap;
-
-  const std::string& GetOverlayKey(const std::string& underlay_key) const;
-  const std::string& GetUnderlayKey(const std::string& overlay_key) const;
-
-  // Returns true if |key| corresponds to a preference that shall be stored in
-  // an in-memory PrefStore that is not persisted to disk.
-  bool ShallBeStoredInOverlay(const std::string& key) const;
-
-  base::ObserverList<PrefStore::Observer, true> observers_;
-  PrefValueMap overlay_;
-  scoped_refptr<PersistentPrefStore> underlay_;
-  NamesMap overlay_to_underlay_names_map_;
-  NamesMap underlay_to_overlay_names_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverlayUserPrefStore);
-};
-
-#endif  // BASE_PREFS_OVERLAY_USER_PREF_STORE_H_