[Sync] Remove entry from SMTP::storage_key_to_tag_hash_ when deleting tracker

components/sync/model_impl/shared_model_type_processor.cc

Index: components/sync/model_impl/shared_model_type_processor.cc
diff --git a/components/sync/model_impl/shared_model_type_processor.cc b/components/sync/model_impl/shared_model_type_processor.cc
index b55963b38da1a4620e56db764787aa9626c5760d..6b5816f90a209628f7a6ad2a741908e70f139088 100644
--- a/components/sync/model_impl/shared_model_type_processor.cc
+++ b/components/sync/model_impl/shared_model_type_processor.cc
@@ -288,6 +288,7 @@ void SharedModelTypeProcessor::OnCommitCompleted(
 
     if (entity->CanClearMetadata()) {
       change_list->ClearMetadata(entity->storage_key());
+      storage_key_to_tag_hash_.erase(entity->storage_key());
       entities_.erase(entity->metadata().client_tag_hash());
     } else {
       change_list->UpdateMetadata(entity->storage_key(), entity->metadata());
@@ -334,6 +335,7 @@ void SharedModelTypeProcessor::OnUpdateReceived(
 
     if (entity->CanClearMetadata()) {
       metadata_changes->ClearMetadata(entity->storage_key());
+      storage_key_to_tag_hash_.erase(entity->storage_key());
       entities_.erase(entity->metadata().client_tag_hash());
     } else {
       metadata_changes->UpdateMetadata(entity->storage_key(),