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 150 matching lines @@
   DCHECK(!key.empty()) << "Key is empty";
   DCHECK(overlay_names_set_.find(key) == overlay_names_set_.end())
       << "Key already registered";
   overlay_names_set_.insert(key);
 }
 
 void OverlayUserPrefStore::ClearMutableValues() {
   overlay_.Clear();
 }
 
+void OverlayUserPrefStore::CleanupForProfileDeletion() {
+  underlay_->CleanupForProfileDeletion();
+}
+
 OverlayUserPrefStore::~OverlayUserPrefStore() {
   underlay_->RemoveObserver(this);
 }
 
 bool OverlayUserPrefStore::ShallBeStoredInOverlay(
     const std::string& key) const {
   return overlay_names_set_.find(key) != overlay_names_set_.end();
 }