leveldb::MojoEnv should not inherit from ChromiumEnv.

components/leveldb/leveldb_service_impl.h

Index: components/leveldb/leveldb_service_impl.h
diff --git a/components/leveldb/leveldb_service_impl.h b/components/leveldb/leveldb_service_impl.h
index aca402228a57c1f5a54f548f6b8011e49761d141..3cc1210d2c19250e7fec5766779d65412ed3eca8 100644
--- a/components/leveldb/leveldb_service_impl.h
+++ b/components/leveldb/leveldb_service_impl.h
@@ -23,7 +23,6 @@ class LevelDBServiceImpl : public mojom::LevelDBService {
   ~LevelDBServiceImpl() override;
 
   // Overridden from LevelDBService:
-  void SetEnvironmentName(const std::string& name) override;
   void Open(filesystem::mojom::DirectoryPtr directory,
             const std::string& dbname,
             leveldb::mojom::LevelDBDatabaseAssociatedRequest database,
@@ -46,8 +45,6 @@ class LevelDBServiceImpl : public mojom::LevelDBService {
   // and receive mojo message calls.
   scoped_refptr<LevelDBMojoProxy> thread_;
 
-  std::string environment_name_;
-
   DISALLOW_COPY_AND_ASSIGN(LevelDBServiceImpl);
 };