Delete the PreferenceMACs on profile deletion.

services/preferences/public/interfaces/preferences.mojom

 // Copyright 2016 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/values.mojom";
 import "services/preferences/public/interfaces/preferences_configuration.mojom";
 
 const string kServiceName = "preferences";
@@ skipping 116 matching lines @@
 
 // An interface providing mutation access to a PersistentPrefStore.
 interface PersistentPrefStore {
   // Sets the values for prefs.
   SetValues(array<PrefUpdate> updates);
 
   // These mirror the C++ PersistentPrefStore methods.
   CommitPendingWrite();
   SchedulePendingLossyWrites();
   ClearMutableValues();
+  CleanupForProfileDeletion();
 };
 
 // A registry of all prefs registered by a single client.
 struct PrefRegistry {
   array<string> registrations;
 };
 
 struct PrefRegistration {
   mojo.common.mojom.Value default_value;
 
   // A bitfield of flags. Flag values are defined in
   // PrefRegistry::PrefRegistrationFlags and
   // PrefRegistrySyncable::PrefRegistrationFlags.
   uint32 flags;
 };
 
 interface PrefServiceControl {
   // Initializes the pref service. This must be called before the service can
   // be used.
   Init(PersistentPrefStoreConfiguration configuration);
 };