Isolate check_internal.py to the .gypi files that need it.

google_apis/google_apis.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
   },
   'includes': [
     '../build/win_precompile.gypi',
   ],
   'targets': [
     {
       'target_name': 'google_apis',
       'type': 'static_library',
+      'includes': [
+        'determine_use_official_keys.gypi',
+      ],
       'dependencies': [
         '../base/base.gyp:base',
         '../crypto/crypto.gyp:crypto',
         '../net/net.gyp:net',
       ],
       'conditions': [
         ['google_api_key!=""', {
           'defines': ['GOOGLE_API_KEY="<(google_api_key)"'],
         }],
         # Once the default definitions for the various keys in
@@ skipping 12 matching lines @@
             'GOOGLE_CLIENT_ID_REMOTING="<(google_default_client_id)"',
           ]
         }],
         ['google_default_client_secret!=""', {
           'defines': [
             'GOOGLE_CLIENT_SECRET_MAIN="<(google_default_client_secret)"',
             'GOOGLE_CLIENT_SECRET_CLOUD_PRINT="<(google_default_client_secret)"',
             'GOOGLE_CLIENT_SECRET_REMOTING="<(google_default_client_secret)"',
           ]
         }],
-        ['use_official_google_api_keys==1', {
-          'defines': ['USE_OFFICIAL_GOOGLE_API_KEYS=1'],
-        }],
       ],
       'sources': [
         'gaia/gaia_auth_consumer.cc',
         'gaia/gaia_auth_consumer.h',
         'gaia/gaia_auth_fetcher.cc',
         'gaia/gaia_auth_fetcher.h',
         'gaia/gaia_auth_util.cc',
         'gaia/gaia_auth_util.h',
         'gaia/gaia_authenticator.cc',
         'gaia/gaia_authenticator.h',
@@ skipping 17 matching lines @@
         'gaia/oauth2_mint_token_flow.cc',
         'gaia/oauth2_mint_token_flow.h',
         'google_api_keys.cc',
         'google_api_keys.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
   ],
 }