Revert of Move base/prefs to components/prefs

components/prefs/persistent_pref_store.h

Index: components/prefs/persistent_pref_store.h
diff --git a/components/prefs/persistent_pref_store.h b/components/prefs/persistent_pref_store.h
deleted file mode 100644
index 89c7a71961c8a4943f3d6749f34d5ea11fcea20c..0000000000000000000000000000000000000000
--- a/components/prefs/persistent_pref_store.h
+++ /dev/null
@@ -1,77 +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_PERSISTENT_PREF_STORE_H_
-#define BASE_PREFS_PERSISTENT_PREF_STORE_H_
-
-#include <string>
-
-#include "base/prefs/base_prefs_export.h"
-#include "base/prefs/writeable_pref_store.h"
-
-// This interface is complementary to the PrefStore interface, declaring
-// additional functionality that adds support for setting values and persisting
-// the data to some backing store.
-class BASE_PREFS_EXPORT PersistentPrefStore : public WriteablePrefStore {
- public:
-  // Unique integer code for each type of error so we can report them
-  // distinctly in a histogram.
-  // NOTE: Don't change the explicit values of the enums as it will change the
-  // server's meaning of the histogram.
-  enum PrefReadError {
-    PREF_READ_ERROR_NONE = 0,
-    PREF_READ_ERROR_JSON_PARSE = 1,
-    PREF_READ_ERROR_JSON_TYPE = 2,
-    PREF_READ_ERROR_ACCESS_DENIED = 3,
-    PREF_READ_ERROR_FILE_OTHER = 4,
-    PREF_READ_ERROR_FILE_LOCKED = 5,
-    PREF_READ_ERROR_NO_FILE = 6,
-    PREF_READ_ERROR_JSON_REPEAT = 7,
-    // PREF_READ_ERROR_OTHER = 8,  // Deprecated.
-    PREF_READ_ERROR_FILE_NOT_SPECIFIED = 9,
-    // Indicates that ReadPrefs() couldn't complete synchronously and is waiting
-    // for an asynchronous task to complete first.
-    PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE = 10,
-    PREF_READ_ERROR_MAX_ENUM
-  };
-
-  class ReadErrorDelegate {
-   public:
-    virtual ~ReadErrorDelegate() {}
-
-    virtual void OnError(PrefReadError error) = 0;
-  };
-
-  // Whether the store is in a pseudo-read-only mode where changes are not
-  // actually persisted to disk.  This happens in some cases when there are
-  // read errors during startup.
-  virtual bool ReadOnly() const = 0;
-
-  // Gets the read error. Only valid if IsInitializationComplete() returns true.
-  virtual PrefReadError GetReadError() const = 0;
-
-  // Reads the preferences from disk. Notifies observers via
-  // "PrefStore::OnInitializationCompleted" when done.
-  virtual PrefReadError ReadPrefs() = 0;
-
-  // Reads the preferences from disk asynchronously. Notifies observers via
-  // "PrefStore::OnInitializationCompleted" when done. Also it fires
-  // |error_delegate| if it is not NULL and reading error has occurred.
-  // Owns |error_delegate|.
-  virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) = 0;
-
-  // Lands any pending writes to disk.
-  virtual void CommitPendingWrite() = 0;
-
-  // Schedule a write if there is any lossy data pending. Unlike
-  // CommitPendingWrite() this does not immediately sync to disk, instead it
-  // triggers an eventual write if there is lossy data pending and if there
-  // isn't one scheduled already.
-  virtual void SchedulePendingLossyWrites() = 0;
-
- protected:
-  ~PersistentPrefStore() override {}
-};
-
-#endif  // BASE_PREFS_PERSISTENT_PREF_STORE_H_