Delete the PreferenceMACs on profile deletion.

services/preferences/persistent_pref_store_impl.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/persistent_pref_store_impl.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
@@ skipping 118 matching lines @@
     observer_->OnPrefsChanged(std::move(updates));
   }
 
   void CommitPendingWrite(CommitPendingWriteCallback done_callback) override {
     pref_store_->CommitPendingWrite(std::move(done_callback));
   }
   void SchedulePendingLossyWrites() override {
     pref_store_->SchedulePendingLossyWrites();
   }
   void ClearMutableValues() override { pref_store_->ClearMutableValues(); }
+  void OnStoreDeletionFromDisk() override {
+    pref_store_->OnStoreDeletionFromDisk();
+  }
 
   void OnConnectionError() { pref_store_->OnConnectionError(this); }
 
   // Owns |this|.
   PersistentPrefStoreImpl* const pref_store_;
 
   mojo::Binding<mojom::PersistentPrefStore> binding_;
   mojom::PrefStoreObserverPtr observer_;
   const ObservedPrefs observed_keys_;
 
@@ skipping 107 matching lines @@
 }
 
 void PersistentPrefStoreImpl::SchedulePendingLossyWrites() {
   backing_pref_store_->SchedulePendingLossyWrites();
 }
 
 void PersistentPrefStoreImpl::ClearMutableValues() {
   backing_pref_store_->ClearMutableValues();
 }
 
+void PersistentPrefStoreImpl::OnStoreDeletionFromDisk() {
+  backing_pref_store_->OnStoreDeletionFromDisk();
+}
+
 void PersistentPrefStoreImpl::OnConnectionError(Connection* connection) {
   connections_.erase(connection);
 }
 
 }  // namespace prefs