Remove GYP files.

ios/net/ios_net_unittests.gyp

-# Copyright 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': {
-    'chromium_code': 1,
-  },
-  'targets': [
-    {
-      # GN version: //ios/net:ios_net_unittests
-      'target_name': 'ios_net_unittests',
-      'type': '<(gtest_target_type)',
-      'dependencies': [
-        '../../base/base.gyp:base',
-        '../../base/base.gyp:run_all_unittests',
-        '../../net/net.gyp:net_test_support',
-        '../../testing/gtest.gyp:gtest',
-        '../../url/url.gyp:url_lib',
-        'ios_net.gyp:ios_net',
-      ],
-      'include_dirs': [
-        '../..',
-      ],
-      'sources': [
-        'clients/crn_forwarding_network_client_factory_unittest.mm',
-        'cookies/cookie_cache_unittest.cc',
-        'cookies/cookie_creation_time_manager_unittest.mm',
-        'cookies/cookie_store_ios_unittest.mm',
-        'cookies/system_cookie_util_unittest.mm',
-        'http_response_headers_util_unittest.mm',
-        'nsurlrequest_util_unittest.mm',
-        'protocol_handler_util_unittest.mm',
-        'url_scheme_util_unittest.mm',
-      ],
-    },
-  ],
-}