Remove adapter method on HistoryBackend delegating to AndroidProviderBackend

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 1507 matching lines @@
       'browser/history/chrome_history_client.cc',
       'browser/history/chrome_history_client.h',
       'browser/history/chrome_history_client_factory.cc',
       'browser/history/chrome_history_client_factory.h',
       'browser/history/content_visit_delegate.cc',
       'browser/history/content_visit_delegate.h',
       'browser/history/delete_directive_handler.cc',
       'browser/history/delete_directive_handler.h',
       'browser/history/history_backend.cc',
       'browser/history/history_backend.h',
-      'browser/history/history_backend_android.cc',
       'browser/history/history_service.cc',
       'browser/history/history_service.h',
       'browser/history/history_service_factory.cc',
       'browser/history/history_service_factory.h',
       'browser/history/history_tab_helper.cc',
       'browser/history/history_tab_helper.h',
       'browser/history/in_memory_history_backend.cc',
       'browser/history/in_memory_history_backend.h',
       'browser/history/in_memory_url_index.cc',
       'browser/history/in_memory_url_index.h',
@@ skipping 2165 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }