Files app: Remove closure compiler targets which are used only in tests.

ui/file_manager/audio_player/js/compiled_resources2.gyp

 # 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.
 {
   'targets': [
 #    {
 #      'target_name': 'audio_player',
 #      'includes': ['../../compile_js2.gypi'],
 #    },
 #    {
 #      'target_name': 'background',
 #      'includes': ['../../compile_js2.gypi'],
 #    },
     {
       'target_name': 'error_util',
       'includes': ['../../compile_js2.gypi'],
     },
     {
       'target_name': 'metadata_worker',
       'includes': ['../../compile_js2.gypi'],
     },
-#    {
-#      'target_name': 'test_util',
-#      'includes': ['../../compile_js2.gypi'],
-#    },
   ],
 }