Revert of Pref service: add support for tracked prefs.

services/preferences/public/interfaces/preferences_configuration.mojom

 // Copyright 2017 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.
 
 module prefs.mojom;
 
 import "mojo/common/file_path.mojom";
-import "mojo/common/string16.mojom";
-import "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom";
 
 union PersistentPrefStoreConfiguration {
   SimplePersistentPrefStoreConfiguration simple_configuration;
-  TrackedPersistentPrefStoreConfiguration tracked_configuration;
 };
 
 struct SimplePersistentPrefStoreConfiguration {
   mojo.common.mojom.FilePath pref_filename;
 };
 
-// These parameters are passed to prefs::CreateTrackedPersistentPrefStore() in
-// services/preferences/persistent_pref_store_factory.cc.
-struct TrackedPersistentPrefStoreConfiguration {
-  mojo.common.mojom.FilePath unprotected_pref_filename;
-  mojo.common.mojom.FilePath protected_pref_filename;
-  array<TrackedPreferenceMetadata> tracking_configuration;
-  uint64 reporting_ids_count;
-  string seed;
-  string legacy_device_id;
-  string registry_seed;
-  mojo.common.mojom.String16 registry_path;
-  TrackedPreferenceValidationDelegate? validation_delegate;
-  ResetOnLoadObserver? reset_on_load_observer;
-};
-
 struct TrackedPreferenceMetadata {
   enum EnforcementLevel { NO_ENFORCEMENT, ENFORCE_ON_LOAD };
 
   enum PrefTrackingStrategy {
     // Atomic preferences are tracked as a whole.
     ATOMIC,
     // Split preferences are dictionaries for which each top-level entry is
     // tracked independently. Note: preferences using this strategy must be kept
     // in sync with TrackedSplitPreferences in histograms.xml.
     SPLIT,
   };
 
   enum ValueType {
     IMPERSONAL,
     // The preference value may contain personal information.
     PERSONAL,
   };
 
   uint64 reporting_id;
   string name;
   EnforcementLevel enforcement_level;
   PrefTrackingStrategy strategy;
   ValueType value_type;
 };
-
-interface ResetOnLoadObserver {
-  OnResetOnLoad();
-};