Componentize //chrome/browser/prefs/tracked.

chrome/browser/prefs/tracked/tracked_preferences_migration.h

-// Copyright 2014 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_TRACKED_TRACKED_PREFERENCES_MIGRATION_H_
-#define CHROME_BROWSER_PREFS_TRACKED_TRACKED_PREFERENCES_MIGRATION_H_
-
-#include <set>
-#include <string>
-
-#include "base/callback_forward.h"
-#include "base/memory/scoped_ptr.h"
-#include "chrome/browser/prefs/tracked/pref_hash_store.h"
-
-class HashStoreContents;
-class InterceptablePrefFilter;
-class PrefHashStore;
-
-// Sets up InterceptablePrefFilter::FilterOnLoadInterceptors on
-// |unprotected_pref_filter| and |protected_pref_filter| which prevents each
-// filter from running their on load operations until the interceptors decide to
-// hand the prefs back to them (after migration is complete). |
-// (un)protected_store_cleaner| and
-// |register_on_successful_(un)protected_store_write_callback| are used to do
-// post-migration cleanup tasks. Those should be bound to weak pointers to avoid
-// blocking shutdown. |(un)protected_pref_hash_store| and
-// |legacy_pref_hash_store| are used to migrate MACs along with their protected
-// preferences and/or from the legacy location in Local State. Migrated MACs
-// will only be cleared from their old location in a subsequent run. The
-// migration framework is resilient to a failed cleanup (it will simply try
-// again in the next Chrome run).
-void SetupTrackedPreferencesMigration(
-    const std::set<std::string>& unprotected_pref_names,
-    const std::set<std::string>& protected_pref_names,
-    const base::Callback<void(const std::string& key)>&
-        unprotected_store_cleaner,
-    const base::Callback<void(const std::string& key)>& protected_store_cleaner,
-    const base::Callback<void(const base::Closure&)>&
-        register_on_successful_unprotected_store_write_callback,
-    const base::Callback<void(const base::Closure&)>&
-        register_on_successful_protected_store_write_callback,
-    scoped_ptr<PrefHashStore> unprotected_pref_hash_store,
-    scoped_ptr<PrefHashStore> protected_pref_hash_store,
-    scoped_ptr<HashStoreContents> legacy_pref_hash_store,
-    InterceptablePrefFilter* unprotected_pref_filter,
-    InterceptablePrefFilter* protected_pref_filter);
-
-#endif  // CHROME_BROWSER_PREFS_TRACKED_TRACKED_PREFERENCES_MIGRATION_H_