Delete the now-obsolete ChromeMainDelegateStagingAndroid.

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 34 matching lines @@
       'browser/android/bookmarks/partner_bookmarks_reader.cc',
       'browser/android/bookmarks/partner_bookmarks_reader.h',
       'browser/android/bookmarks/partner_bookmarks_shim.cc',
       'browser/android/bookmarks/partner_bookmarks_shim.h',
       'browser/android/bottombar/contextualsearch/contextual_search_panel.cc',
       'browser/android/bottombar/contextualsearch/contextual_search_panel.h',
       'browser/android/chrome_application.cc',
       'browser/android/chrome_application.h',
       'browser/android/chrome_jni_registrar.cc',
       'browser/android/chrome_jni_registrar.h',
-      'browser/android/chrome_main_delegate_staging_android.cc',
-      'browser/android/chrome_main_delegate_staging_android.h',
       'browser/android/chrome_media_client_android.cc',
       'browser/android/chrome_media_client_android.h',
       'browser/android/chrome_startup_flags.cc',
       'browser/android/chrome_startup_flags.h',
       'browser/android/chrome_web_contents_delegate_android.cc',
       'browser/android/chrome_web_contents_delegate_android.h',
       'browser/android/compositor/compositor_view.cc',
       'browser/android/compositor/compositor_view.h',
       'browser/android/compositor/decoration_title.cc',
       'browser/android/compositor/decoration_title.h',
@@ skipping 4056 matching lines @@
             '../components/components.gyp:omnibox_browser',
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }