Fix lifetime of leveldb::MojoEnv instances.

components/leveldb/leveldb_database_impl.h

Index: components/leveldb/leveldb_database_impl.h
diff --git a/components/leveldb/leveldb_database_impl.h b/components/leveldb/leveldb_database_impl.h
index f621c5f50574e636bc474adb9f0ab7f07d069b83..5c6e25ae82702f8325b9cd4464f5e35e133d2909 100644
--- a/components/leveldb/leveldb_database_impl.h
+++ b/components/leveldb/leveldb_database_impl.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/unguessable_token.h"
+#include "components/leveldb/env_mojo.h"
 #include "components/leveldb/public/interfaces/leveldb.mojom.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
@@ -17,8 +18,10 @@ namespace leveldb {
 // The backing to a database object that we pass to our called.
 class LevelDBDatabaseImpl : public mojom::LevelDBDatabase {
  public:
-  LevelDBDatabaseImpl(std::unique_ptr<leveldb::Env> environment,
-                      std::unique_ptr<leveldb::DB> db);
+  LevelDBDatabaseImpl(std::unique_ptr<Env> owned_environment,
+                      std::unique_ptr<DB> db);
+  LevelDBDatabaseImpl(std::unique_ptr<MojoEnv::Directory> directory,
+                      std::unique_ptr<DB> db);
   ~LevelDBDatabaseImpl() override;
 
   // Overridden from LevelDBDatabase:
@@ -68,8 +71,9 @@ class LevelDBDatabaseImpl : public mojom::LevelDBDatabase {
   leveldb::Status DeletePrefixedHelper(const leveldb::Slice& key_prefix,
                                        leveldb::WriteBatch* batch);
 
-  std::unique_ptr<leveldb::Env> environment_;
-  std::unique_ptr<leveldb::DB> db_;
+  std::unique_ptr<Env> owned_environment_;
+  std::unique_ptr<MojoEnv::Directory> directory_;
+  std::unique_ptr<DB> db_;
 
   std::map<base::UnguessableToken, const Snapshot*> snapshot_map_;