Remove GYP files from components.

components/pref_registry.gypi

-# Copyright (c) 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.
-
-{
-  'targets': [
-    {
-      # GN version: //components/pref_registry
-      'target_name': 'pref_registry',
-      'type': 'static_library',
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
-        'prefs/prefs.gyp:prefs',
-      ],
-      'include_dirs': [
-        '..',
-      ],
-      'sources': [
-        'pref_registry/pref_registry_syncable.cc',
-        'pref_registry/pref_registry_syncable.h',
-      ],
-    },
-    {
-      # GN version: //components/pref_registry:test_support
-      'target_name': 'pref_registry_test_support',
-      'type': 'static_library',
-      'dependencies': [
-        'pref_registry',
-        'prefs/prefs.gyp:prefs_test_support',
-      ],
-      'include_dirs': [
-        '..',
-      ],
-      'sources': [
-        'pref_registry/testing_pref_service_syncable.cc',
-        'pref_registry/testing_pref_service_syncable.h',
-      ],
-    },
-  ],
-}