Remove GYP files from components.

components/undo.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/undo
-      'target_name': 'undo_component',
-      'type': 'static_library',
-      'include_dirs': [
-        '..',
-      ],
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../ui/base/ui_base.gyp:ui_base',
-        'bookmarks_browser',
-        'components_strings.gyp:components_strings',
-        'keyed_service_core',
-      ],
-      'sources': [
-        'undo/bookmark_undo_service.cc',
-        'undo/bookmark_undo_service.h',
-        'undo/bookmark_undo_utils.cc',
-        'undo/bookmark_undo_utils.h',
-        'undo/undo_manager.cc',
-        'undo/undo_manager.h',
-        'undo/undo_manager_observer.h',
-        'undo/undo_operation.h',
-      ],
-    },
-  ],
-}