Remove all old-style DeviceManagementService legacy.

chrome/chrome_browser.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',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1810 matching lines @@
         'browser/policy/configuration_policy_provider_delegate_win.cc',
         'browser/policy/configuration_policy_provider_delegate_win.h',
         'browser/policy/configuration_policy_provider_mac.cc',
         'browser/policy/configuration_policy_provider_mac.h',
         'browser/policy/configuration_policy_provider_win.cc',
         'browser/policy/configuration_policy_provider_win.h',
         'browser/policy/configuration_policy_reader.cc',
         'browser/policy/configuration_policy_reader.h',
         'browser/policy/delayed_work_scheduler.cc',
         'browser/policy/delayed_work_scheduler.h',
-        'browser/policy/device_management_backend.h',
-        'browser/policy/device_management_backend_impl.cc',
-        'browser/policy/device_management_backend_impl.h',
         'browser/policy/device_management_service.cc',
         'browser/policy/device_management_service.h',
         'browser/policy/device_policy_cache.cc',
         'browser/policy/device_policy_cache.h',
         'browser/policy/device_token_fetcher.cc',
         'browser/policy/device_token_fetcher.h',
         'browser/policy/device_status_collector.cc',
         'browser/policy/device_status_collector.h',
         'browser/policy/enterprise_install_attributes.cc',
         'browser/policy/enterprise_install_attributes.h',
@@ skipping 3571 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }