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

components/data_reduction_proxy/core/browser/data_store_impl.cc

Index: components/data_reduction_proxy/core/browser/data_store_impl.cc
diff --git a/components/data_reduction_proxy/core/browser/data_store_impl.cc b/components/data_reduction_proxy/core/browser/data_store_impl.cc
index 3c7c180fe9637de40870512c7d6720da7014f965..1de44d927c86e5598cd97032b25cebfe0f4fe405 100644
--- a/components/data_reduction_proxy/core/browser/data_store_impl.cc
+++ b/components/data_reduction_proxy/core/browser/data_store_impl.cc
@@ -123,7 +123,7 @@ DataStore::Status DataStoreImpl::OpenDB() {
   std::string db_name = profile_path_.Append(kDBName).AsUTF8Unsafe();
   leveldb::DB* dbptr = nullptr;
   Status status =
-      LevelDbToDRPStoreStatus(leveldb::DB::Open(options, db_name, &dbptr));
+      LevelDbToDRPStoreStatus(leveldb_env::DBRegistry::Open(options, db_name, &dbptr));
   UMA_HISTOGRAM_ENUMERATION("DataReductionProxy.LevelDBOpenStatus", status,
                             STATUS_MAX);