Split components_tests into a separate gyp file

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,
    },
   'includes': [
     'autofill.gypi',
     'auto_login_parser.gypi',
     'breakpad.gypi',
     'browser_context_keyed_service.gypi',
-    'components_tests.gypi',
     'dom_distiller.gypi',
     'json_schema.gypi',
     'navigation_interception.gypi',
     'onc.gypi',
     'plugins.gypi',
     'policy.gypi',
     'precache.gypi',
     'sessions.gypi',
     'startup_metric_utils.gypi',
     'translate.gypi',
     'user_prefs.gypi',
     'variations.gypi',
     'visitedlink.gypi',
     'webdata.gypi',
     'web_contents_delegate_android.gypi',
     'web_modal.gypi',
   ],
 }