Remove GYP files.

ios/web/ios_web_resources.gyp

-# Copyright (c) 2016 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.
-
-{
-  'targets': [
-    {
-      # GN version: //ios/web:resources
-      'target_name': 'ios_web_resources',
-      'type': 'none',
-      'variables': {
-        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/ios/web',
-      },
-      'actions': [
-        {
-          'action_name': 'generate_ios_web_resources',
-          'variables': {
-            'grit_grd_file': 'ios_web_resources.grd',
-          },
-          'grit_additional_defines': [
-              '-E', 'root_out_dir=<(PRODUCT_DIR)',
-            ],
-          'includes': [ '../../build/grit_action.gypi' ],
-        },
-      ],
-      'copies': [
-        {
-          'destination': '<(PRODUCT_DIR)',
-          'files': [
-            '<(SHARED_INTERMEDIATE_DIR)/ios/web/ios_web_resources.pak'
-          ],
-        },
-      ],
-    },
-  ],
-}