Delete the PreferenceMACs on profile deletion.

services/preferences/tracked/segregated_pref_store.cc

 // 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.
 
 #include "services/preferences/tracked/segregated_pref_store.h"
 
 #include <utility>
 
 #include "base/barrier_closure.h"
 #include "base/logging.h"
@@ skipping 160 matching lines @@
 
 void SegregatedPrefStore::SchedulePendingLossyWrites() {
   default_pref_store_->SchedulePendingLossyWrites();
   selected_pref_store_->SchedulePendingLossyWrites();
 }
 
 void SegregatedPrefStore::ClearMutableValues() {
   NOTIMPLEMENTED();
 }
 
+void SegregatedPrefStore::OnStoreDeletionFromDisk() {
+  default_pref_store_->OnStoreDeletionFromDisk();
+  selected_pref_store_->OnStoreDeletionFromDisk();
+}
+
 SegregatedPrefStore::~SegregatedPrefStore() {
   default_pref_store_->RemoveObserver(&aggregating_observer_);
   selected_pref_store_->RemoveObserver(&aggregating_observer_);
 }
 
 PersistentPrefStore* SegregatedPrefStore::StoreForKey(const std::string& key) {
   return (base::ContainsKey(selected_preference_names_, key)
               ? selected_pref_store_
               : default_pref_store_)
       .get();
 }
 
 const PersistentPrefStore* SegregatedPrefStore::StoreForKey(
     const std::string& key) const {
   return (base::ContainsKey(selected_preference_names_, key)
               ? selected_pref_store_
               : default_pref_store_)
       .get();
 }