Move tracked prefs into services/preferences/tracked.

components/user_prefs/tracked/pref_hash_store_impl.h

-// Copyright 2013 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 COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_STORE_IMPL_H_
-#define COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_STORE_IMPL_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "components/user_prefs/tracked/pref_hash_calculator.h"
-#include "components/user_prefs/tracked/pref_hash_store.h"
-
-// Implements PrefHashStoreImpl by storing preference hashes in a
-// HashStoreContents.
-class PrefHashStoreImpl : public PrefHashStore {
- public:
-  enum StoreVersion {
-    // No hashes have been stored in this PrefHashStore yet.
-    VERSION_UNINITIALIZED = 0,
-    // The hashes in this PrefHashStore were stored before the introduction
-    // of a version number and should be re-initialized.
-    VERSION_PRE_MIGRATION = 1,
-    // The hashes in this PrefHashStore were stored using the latest algorithm.
-    VERSION_LATEST = 2,
-  };
-
-  // Constructs a PrefHashStoreImpl that calculates hashes using
-  // |seed| and |legacy_device_id| and stores them in |contents|.
-  //
-  // The same |seed| and |legacy_device_id| must be used to load and validate
-  // previously stored hashes in |contents|.
-  PrefHashStoreImpl(const std::string& seed,
-                    const std::string& legacy_device_id,
-                    bool use_super_mac);
-
-  ~PrefHashStoreImpl() override;
-
-  // Clears the contents of this PrefHashStore. |IsInitialized()| will return
-  // false after this call.
-  void Reset();
-
-  // PrefHashStore implementation.
-  std::unique_ptr<PrefHashStoreTransaction> BeginTransaction(
-      HashStoreContents* storage) override;
-
-  std::string ComputeMac(const std::string& path,
-                         const base::Value* new_value) override;
-  std::unique_ptr<base::DictionaryValue> ComputeSplitMacs(
-      const std::string& path,
-      const base::DictionaryValue* split_values) override;
-
- private:
-  class PrefHashStoreTransactionImpl;
-
-  const PrefHashCalculator pref_hash_calculator_;
-  bool use_super_mac_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrefHashStoreImpl);
-};
-
-#endif  // COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_STORE_IMPL_H_