Delete the PreferenceMACs on profile deletion.

services/preferences/public/cpp/persistent_pref_store_client.cc

 // 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.
 
 #include "services/preferences/public/cpp/persistent_pref_store_client.h"
 
 #include "base/values.h"
 #include "components/prefs/pref_registry.h"
 #include "mojo/common/values.mojom.h"
 #include "mojo/common/values_struct_traits.h"
@@ skipping 225 matching lines @@
 void PersistentPrefStoreClient::SchedulePendingLossyWrites() {
   DCHECK(pref_store_);
   return pref_store_->SchedulePendingLossyWrites();
 }
 
 void PersistentPrefStoreClient::ClearMutableValues() {
   DCHECK(pref_store_);
   return pref_store_->ClearMutableValues();
 }
 
+void PersistentPrefStoreClient::OnStoreDeletionFromDisk() {
+  DCHECK(pref_store_);
+  return pref_store_->OnStoreDeletionFromDisk();
+}
+
 PersistentPrefStoreClient::~PersistentPrefStoreClient() {
   if (!pref_store_)
     return;
 
   CommitPendingWrite(base::OnceClosure());
 }
 
 void PersistentPrefStoreClient::QueueWrite(
     const std::string& key,
     std::set<std::vector<std::string>> path_components,
@@ skipping 111 matching lines @@
   auto decision = it->second.Lookup(path.begin(), path.end());
   if (decision == InFlightWriteTrie::Decision::kAllow) {
     return false;
   }
   if (decision == InFlightWriteTrie::Decision::kResolve)
     pref_store_->RequestValue(key, path);
   return true;
 }
 
 }  // namespace prefs