Revert 132517 - Metro/HiDPI: Move 1x icons into separate pak file

chrome/chrome_repack_theme_resources_2x.gypi

 # Copyright (c) 2012 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.
 {
   'action_name': 'repack_theme_resources_2x',
   'variables': {
     'pak_inputs': [
       '<(grit_out_dir)/theme_resources_2x.pak',
     ],
   },
   'inputs': [
     '<(repack_path)',
     '<@(pak_inputs)',
   ],
   'outputs': [
     '<(INTERMEDIATE_DIR)/repack/theme_resources_2x.pak',
   ],
   'action': ['python', '<(repack_path)', '<@(_outputs)',
              '<@(pak_inputs)'],
   'process_outputs_as_mac_bundle_resources': 1,
 }