Delete the PreferenceMACs on profile deletion.

services/preferences/public/cpp/persistent_pref_store_client.cc

Index: services/preferences/public/cpp/persistent_pref_store_client.cc
diff --git a/services/preferences/public/cpp/persistent_pref_store_client.cc b/services/preferences/public/cpp/persistent_pref_store_client.cc
index baf9aa1ab3fdbc901f3dca1735325df5c4084627..848042645a0565fd82455f2f4277990294aae0ca 100644
--- a/services/preferences/public/cpp/persistent_pref_store_client.cc
+++ b/services/preferences/public/cpp/persistent_pref_store_client.cc
@@ -179,6 +179,11 @@ void PersistentPrefStoreClient::ClearMutableValues() {
   return pref_store_->ClearMutableValues();
 }
 
+void PersistentPrefStoreClient::CleanupForProfileDeletion() {
+  DCHECK(pref_store_);
+  return pref_store_->CleanupForProfileDeletion();
+}
+
 PersistentPrefStoreClient::~PersistentPrefStoreClient() {
   if (!pref_store_)
     return;