Normalize _unittest.cc filename suffix for unittests

ash/test/ash_unittests.cc

-// Copyright (c) 2011 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.
-
-#include "ash/test/test_suite.h"
-#include "base/bind.h"
-#include "base/test/launcher/unit_test_launcher.h"
-
-int main(int argc, char** argv) {
-  ash::test::AuraShellTestSuite test_suite(argc, argv);
-
-  return base::LaunchUnitTestsSerially(
-      argc,
-      argv,
-      base::Bind(&ash::test::AuraShellTestSuite::Run,
-                 base::Unretained(&test_suite)));
-}