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

ui/file_manager/image_loader/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': 'background',
 #      'includes': ['../compile_js2.gypi'],
 #    },
 #    {
 #      'target_name': 'cache',
 #      'includes': ['../compile_js2.gypi'],
 #    },
 #    {
-#      'target_name': 'cache_unittest',
-#      'includes': ['../compile_js2.gypi'],
-#    },
-#    {
 #      'target_name': 'image_loader',
 #      'includes': ['../compile_js2.gypi'],
 #    },
 #    {
 #      'target_name': 'image_loader_client',
 #      'includes': ['../compile_js2.gypi'],
 #    },
 #    {
-#      'target_name': 'image_loader_client_unittest',
-#      'includes': ['../compile_js2.gypi'],
-#    },
-#    {
-#      'target_name': 'image_loader_unittest',
-#      'includes': ['../compile_js2.gypi'],
-#    },
-#    {
 #      'target_name': 'piex_loader',
 #      'includes': ['../compile_js2.gypi'],
 #    },
 #    {
 #      'target_name': 'request',
 #      'includes': ['../compile_js2.gypi'],
 #    },
 #    {
 #      'target_name': 'scheduler',
 #      'includes': ['../compile_js2.gypi'],
 #    },
   ],
 }