Try 2: Completely redo how themes are stored on disk and processed at install time.

base/base.gypi

 # Copyright (c) 2009 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 313 matching lines @@
                 'crypto/cssm_init.cc',
                 'crypto/cssm_init.h',
               ],
             }
           ],
           [ 'OS == "win"', {
               'include_dirs': [
                 '../chrome/third_party/wtl/include',
               ],
               'sources!': [
-                'data_pack.cc',
                 'event_recorder_stubs.cc',
                 'file_descriptor_shuffle.cc',
                 'message_pump_libevent.cc',
                 'string16.cc',
               ],
           },],
         ],
       }],
     ],
   },
@@ skipping 243 matching lines @@
           'configurations': {
             'Common': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }