leveldb: Add DBTracker for exposing databases to Chrome's memory-infra.

components/sync/model_impl/model_type_store_backend.cc

Index: components/sync/model_impl/model_type_store_backend.cc
diff --git a/components/sync/model_impl/model_type_store_backend.cc b/components/sync/model_impl/model_type_store_backend.cc
index a277b82f8cc0918bceae1263691540fafa80bded..489b9c2ccded02abc63d4348e8937b1e72876189 100644
--- a/components/sync/model_impl/model_type_store_backend.cc
+++ b/components/sync/model_impl/model_type_store_backend.cc
@@ -187,7 +187,7 @@ leveldb::Status ModelTypeStoreBackend::OpenDatabase(const std::string& path,
   if (env)
     options.env = env;
 
-  leveldb::Status status = leveldb::DB::Open(options, path, &db_raw);
+  leveldb::Status status = leveldb_env::DBRegistry::Open(options, path, &db_raw);
   DCHECK(status.ok() != (db_raw == nullptr));
   if (status.ok())
     db_.reset(db_raw);