Use leveldb_env::OpenDB() to open leveldb databases.

third_party/leveldatabase/env_chromium.h

Index: third_party/leveldatabase/env_chromium.h
diff --git a/third_party/leveldatabase/env_chromium.h b/third_party/leveldatabase/env_chromium.h
index adc9c25275888f57a7eaeb8489eebe60de72107f..38c0cdb3f2435b62229c5b9cc3068b929a04d76c 100644
--- a/third_party/leveldatabase/env_chromium.h
+++ b/third_party/leveldatabase/env_chromium.h
@@ -242,6 +242,11 @@ class DBTracker {
   // DBTracker singleton instance.
   static DBTracker* GetInstance();
 
+  // Returns name of memory-infra dump for |db|. Can be used to attach
+  // additional info to the database dump, or to properly attribute memory
+  // usage in memory dump providers that also dump |db|.
+  static std::string GetMemoryDumpName(leveldb::DB* db);
+
   // Provides extra information about a tracked database.
   class TrackedDB : public leveldb::DB {
    public: