Nukes the gyp/gypi files in ui

ui/content_accelerators/ui_content_accelerators.gyp

-# Copyright 2014 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: //ui/content_accelerators
-      'target_name': 'ui_content_accelerators',
-      'type': 'static_library',
-      'dependencies': [
-        '../base/ui_base.gyp:ui_base',
-        '../events/events.gyp:events',
-        '../../content/content.gyp:content_browser',
-        '../../third_party/WebKit/public/blink_headers.gyp:blink_headers',
-      ],
-      'sources' : [
-        # Note: file list duplicated in GN build.
-        'accelerator_util.cc',
-        'accelerator_util.h',
-      ],
-    },
-  ],
-}