Delete the PreferenceMACs on profile deletion.

components/prefs/overlay_user_pref_store.cc

 // Copyright (c) 2012 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 "components/prefs/overlay_user_pref_store.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 179 matching lines @@
       << "Key already registered";
   overlay_names_set_.insert(key);
 }
 
 void OverlayUserPrefStore::ClearMutableValues() {
   for (const auto& key : written_overlay_names_) {
     overlay_->RemoveValue(key, WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
   }
 }
 
+void OverlayUserPrefStore::OnStoreDeletionFromDisk() {
+  underlay_->OnStoreDeletionFromDisk();
+}
+
 OverlayUserPrefStore::~OverlayUserPrefStore() {
   overlay_->RemoveObserver(overlay_observer_.get());
   underlay_->RemoveObserver(underlay_observer_.get());
 }
 
 void OverlayUserPrefStore::OnPrefValueChanged(bool overlay,
                                               const std::string& key) {
   if (overlay) {
     ReportValueChanged(key, DEFAULT_PREF_WRITE_FLAGS);
   } else {
     if (!overlay_->GetValue(key, NULL))
       ReportValueChanged(key, DEFAULT_PREF_WRITE_FLAGS);
   }
 }
 
 void OverlayUserPrefStore::OnInitializationCompleted(bool overlay,
                                                      bool succeeded) {
   if (!IsInitializationComplete())
     return;
   for (PrefStore::Observer& observer : observers_)
     observer.OnInitializationCompleted(succeeded);
 }
 
 bool OverlayUserPrefStore::ShallBeStoredInOverlay(
     const std::string& key) const {
   return overlay_names_set_.find(key) != overlay_names_set_.end();
 }