Removed webui_generator and new OOBE UI placeholder.

ui/oobe/oobe.gyp

-# Copyright (c) 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: //ui/oobe:resources
-      'target_name': 'oobe_resources',
-      'type': 'none',
-      'variables': {
-        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/ui/oobe',
-      },
-      'actions': [
-        {
-          'action_name': 'oobe_resources',
-          'variables': {
-            'grit_grd_file': 'oobe_resources.grd',
-          },
-          'includes': [ '../../build/grit_action.gypi' ],
-        },
-      ],
-      'includes': [ '../../build/grit_target.gypi' ],
-      'copies': [
-        {
-          'destination': '<(PRODUCT_DIR)',
-          'files': [
-            '<(grit_out_dir)/oobe_resources.pak',
-          ],
-        },
-      ],
-    },
-    {
-      'variables': {
-        'declaration_file': 'declarations/oobe.json',
-      },
-      'includes': ['../../components/webui_generator/generator/wug.gypi'],
-    },
-    {
-      # GN version: //ui/oobe
-      'target_name': 'oobe',
-      'type': '<(component)',
-      'defines': [
-        'OOBE_IMPLEMENTATION'
-      ],
-      'dependencies': [
-        '<(DEPTH)/base/base.gyp:base',
-        '<(DEPTH)/content/content.gyp:content_browser',
-        '<(DEPTH)/components/components.gyp:webui_generator',
-        'oobe_resources',
-        'oobe_wug_generated',
-      ],
-      'sources': [
-        '<(SHARED_INTERMEDIATE_DIR)/ui/oobe/grit/oobe_resources_map.cc',
-        'oobe_md_ui.cc',
-        'oobe_md_ui.h',
-        'oobe_export.h',
-      ],
-      'export_dependent_settings': [
-        '<(DEPTH)/content/content.gyp:content_browser',
-      ]
-    },
-  ]
-}