Componentize spellcheck [1]: create component and move switches there.

components/components.gyp

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 65 matching lines @@
     'proxy_config.gypi',
     'query_parser.gypi',
     'rappor.gypi',
     'search.gypi',
     'search_engines.gypi',
     'search_provider_logos.gypi',
     'security_interstitials.gypi',
     'security_state.gypi',
     'sessions.gypi',
     'signin.gypi',
+    'spellcheck.gypi',
     'ssl_config.gypi',
     'ssl_errors.gypi',
     'subresource_filter.gypi',
     'suggestions.gypi',
     'supervised_user_error_page.gypi',
     'sync_bookmarks.gypi',
     'sync_driver.gypi',
     'sync_sessions.gypi',
     'syncable_prefs.gypi',
     'toolbar.gypi',
@@ skipping 105 matching lines @@
         'rlz.gypi',
       ],
     }],
     ['use_ash==1', {
       'includes': [
         'exo.gypi',
       ],
     }],
   ],
 }