Remove GYP files from components.

components/security_interstitials.gypi

-# Copyright 2015 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: //components/security_interstitials/core
-      'target_name': 'security_interstitials_core',
-      'type': 'static_library',
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../base/base.gyp:base_i18n',
-        '../net/net.gyp:net',
-        '../ui/base/ui_base.gyp:ui_base',
-        'components_strings.gyp:components_strings',
-        'google_core_browser',
-        'history_core_browser',
-        'metrics',
-        'rappor',
-        'ssl_errors',
-        'url_formatter/url_formatter.gyp:url_formatter'
-      ],
-      'include_dirs': [
-        '..',
-      ],
-      'sources': [
-        # Note: sources list duplicated in GN build.
-        'security_interstitials/core/bad_clock_ui.cc',
-        'security_interstitials/core/bad_clock_ui.h',
-        'security_interstitials/core/common_string_util.cc',
-        'security_interstitials/core/common_string_util.h',
-        'security_interstitials/core/controller_client.cc',
-        'security_interstitials/core/controller_client.h',
-        'security_interstitials/core/metrics_helper.cc',
-        'security_interstitials/core/metrics_helper.h',
-        'security_interstitials/core/ssl_error_ui.cc',
-        'security_interstitials/core/ssl_error_ui.h',
-      ]
-    }
-  ]
-}