Revert 127833 - Re-land alexbost's experimental offscreenTabs API.

chrome/chrome_browser_extensions.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_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 72 matching lines @@
         'browser/extensions/api/dns/dns_api.cc',
         'browser/extensions/api/dns/dns_api.h',
         'browser/extensions/api/extension_action/extension_actions_api.cc',
         'browser/extensions/api/extension_action/extension_actions_api.h',
         'browser/extensions/api/extension_action/extension_browser_actions_api.cc',
         'browser/extensions/api/extension_action/extension_browser_actions_api.h',
         'browser/extensions/api/extension_action/extension_page_actions_api.cc',
         'browser/extensions/api/extension_action/extension_page_actions_api.h',
         'browser/extensions/api/extension_action/extension_page_actions_api_constants.cc',
         'browser/extensions/api/extension_action/extension_page_actions_api_constants.h',
-        'browser/extensions/api/offscreen_tabs/offscreen_tabs_api.cc',
-        'browser/extensions/api/offscreen_tabs/offscreen_tabs_api.h',
-        'browser/extensions/api/offscreen_tabs/offscreen_tabs_constants.cc',
-        'browser/extensions/api/offscreen_tabs/offscreen_tabs_constants.h',
         'browser/extensions/api/permissions/permissions_api.cc',
         'browser/extensions/api/permissions/permissions_api.h',
         'browser/extensions/api/permissions/permissions_api_helpers.cc',
         'browser/extensions/api/permissions/permissions_api_helpers.h',
         'browser/extensions/api/proxy/proxy_api.cc',
         'browser/extensions/api/proxy/proxy_api.h',
         'browser/extensions/api/proxy/proxy_api_constants.cc',
         'browser/extensions/api/proxy/proxy_api_constants.h',
         'browser/extensions/api/proxy/proxy_api_helpers.cc',
         'browser/extensions/api/proxy/proxy_api_helpers.h',
@@ skipping 474 matching lines @@
                 }],
               ],
             }],
           ],
         }],
       ],
     },
   ],
 }