Delete the PreferenceMACs on profile deletion.

components/prefs/pref_service.cc

Index: components/prefs/pref_service.cc
diff --git a/components/prefs/pref_service.cc b/components/prefs/pref_service.cc
index dccebf458a210c6ddc95eb23d5926f8834c24944..57672cf1c2882e4bfa101bcb3cdaa1899b5fdf71 100644
--- a/components/prefs/pref_service.cc
+++ b/components/prefs/pref_service.cc
@@ -374,6 +374,10 @@ void PrefService::ClearMutableValues() {
   user_pref_store_->ClearMutableValues();
 }
 
+void PrefService::CleanupForProfileDeletion() {
+  user_pref_store_->CleanupForProfileDeletion();
+}
+
 void PrefService::Set(const std::string& path, const base::Value& value) {
   SetUserPrefValue(path, value.CreateDeepCopy());
 }