Convert leveldb_apptests to unit tests.

components/leveldb/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("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
+import("//testing/test.gni")
 
 source_set("lib") {
   sources = [
     "env_mojo.cc",
     "env_mojo.h",
     "leveldb_database_impl.cc",
     "leveldb_database_impl.h",
     "leveldb_file_thread.cc",
     "leveldb_file_thread.h",
     "leveldb_service_impl.cc",
@@ skipping 34 matching lines @@
   data_deps = [
     ":manifest",
   ]
 }
 
 mojo_application_manifest("manifest") {
   application_name = "leveldb"
   source = "manifest.json"
 }
 
-mojo_native_application("apptests") {
-  output_name = "leveldb_apptests"
-
-  testonly = true
+test("unittests") {
+  output_name = "leveldb_service_unittests"
 
   sources = [
-    "leveldb_apptest.cc",
+    "leveldb_service_unittest.cc",
   ]
 
   deps = [
     "//base",
     "//components/filesystem/public/interfaces",
     "//components/leveldb/public/interfaces",
     "//mojo/common",
-    "//mojo/platform_handle:for_shared_library",
+    "//mojo/platform_handle",
     "//mojo/public/cpp/bindings",
-    "//mojo/shell/public/cpp:test_support",
+    "//mojo/shell/public/cpp:shell_test_support",
+    "//mojo/shell/public/cpp:sources",
+    "//mojo/shell/public/cpp/test:run_all_shelltests",
   ]
 
   data_deps = [
-    ":apptest_manifest",
+    ":test_manifest",
     ":leveldb",
     "//components/filesystem:filesystem",
   ]
 }
 
-mojo_application_manifest("apptest_manifest") {
-  application_name = "leveldb_apptests"
-  source = "apptest_manifest.json"
+mojo_application_manifest("test_manifest") {
+  type = "exe"
+  application_name = "leveldb_service_unittests"
+  source = "test_manifest.json"
 }