Remove the old wallpaper picker code

chrome/chrome_browser_ui.gypi

 # Copyright (c) 2012 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': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
@@ skipping 1935 matching lines @@
         'browser/ui/webui/options/chromeos/language_mozc_handler.cc',
         'browser/ui/webui/options/chromeos/language_mozc_handler.h',
         'browser/ui/webui/options/chromeos/language_options_util.cc',
         'browser/ui/webui/options/chromeos/language_options_util.h',
         'browser/ui/webui/options/chromeos/language_pinyin_handler.cc',
         'browser/ui/webui/options/chromeos/language_pinyin_handler.h',
         'browser/ui/webui/options/chromeos/pointer_handler.cc',
         'browser/ui/webui/options/chromeos/pointer_handler.h',
         'browser/ui/webui/options/chromeos/proxy_handler.cc',
         'browser/ui/webui/options/chromeos/proxy_handler.h',
-        'browser/ui/webui/options/chromeos/set_wallpaper_options_handler.cc',
-        'browser/ui/webui/options/chromeos/set_wallpaper_options_handler.h',
         'browser/ui/webui/options/chromeos/stats_options_handler.cc',
         'browser/ui/webui/options/chromeos/stats_options_handler.h',
         'browser/ui/webui/options/chromeos/timezone_options_util.cc',
         'browser/ui/webui/options/chromeos/timezone_options_util.h',
         'browser/ui/webui/options/chromeos/user_image_source.cc',
         'browser/ui/webui/options/chromeos/user_image_source.h',
         'browser/ui/webui/options/chromeos/wallpaper_source.cc',
         'browser/ui/webui/options/chromeos/wallpaper_source.h',
-        'browser/ui/webui/options/chromeos/wallpaper_thumbnail_source.cc',
-        'browser/ui/webui/options/chromeos/wallpaper_thumbnail_source.h',
         'browser/ui/webui/options/clear_browser_data_handler.cc',
         'browser/ui/webui/options/clear_browser_data_handler.h',
         'browser/ui/webui/options/content_settings_handler.cc',
         'browser/ui/webui/options/content_settings_handler.h',
         'browser/ui/webui/options/cookies_view_handler.cc',
         'browser/ui/webui/options/cookies_view_handler.h',
         'browser/ui/webui/options/core_options_handler.cc',
         'browser/ui/webui/options/core_options_handler.h',
         'browser/ui/webui/options/font_settings_handler.cc',
         'browser/ui/webui/options/font_settings_handler.h',
@@ skipping 773 matching lines @@
         }, { # else: enable_app_list==0
           'sources/': [
             ['exclude', '^browser/ui/views/app_list/'],
             ['exclude', '^browser/ui/app_list/'],
           ]
         }],
       ],
     },
   ],
 }