Fix lifetime of leveldb::MojoEnv instances.

services/file/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 
 source_set("lib") {
   sources = [
     "file_service.cc",
     "file_service.h",
     "file_system.cc",
     "file_system.h",
     "user_id_map.cc",
     "user_id_map.h",
   ]
 
   deps = [
     "//base",
     "//components/filesystem:lib",
     "//components/filesystem/public/interfaces",
     "//components/leveldb:lib",
     "//components/leveldb/public/interfaces",
     "//mojo/common",
     "//mojo/common:common_base",
     "//services/file/public/interfaces",
     "//services/service_manager/public/cpp",
     "//services/service_manager/public/interfaces",
     "//services/tracing/public/cpp",
+    "//third_party/leveldatabase",
     "//url",
   ]
 }
 
 service_manifest("manifest") {
   name = "file"
   source = "manifest.json"
 }