Cleanup: remove IdentityAccountTracker (replaced by gaia::AccountTracker)

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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': {
     # These variables are shared with the GN build.
     # Name is that these are the extensions files for the extensions target.
     # "chrome_browser_extensions_sources' are the extensions files in the
     # browser target.
@@ skipping 558 matching lines @@
       'browser/extensions/api/hid/hid_connection_resource.cc',
       'browser/extensions/api/hid/hid_connection_resource.h',
       'browser/extensions/api/hid/hid_device_manager.cc',
       'browser/extensions/api/hid/hid_device_manager.h',
       'browser/extensions/api/history/history_api.cc',
       'browser/extensions/api/history/history_api.h',
       'browser/extensions/api/hotword_private/hotword_private_api.cc',
       'browser/extensions/api/hotword_private/hotword_private_api.h',
       'browser/extensions/api/i18n/i18n_api.cc',
       'browser/extensions/api/i18n/i18n_api.h',
-      'browser/extensions/api/identity/account_tracker.cc',
-      'browser/extensions/api/identity/account_tracker.h',
       'browser/extensions/api/identity/extension_token_key.cc',
       'browser/extensions/api/identity/extension_token_key.h',
       'browser/extensions/api/identity/gaia_web_auth_flow.cc',
       'browser/extensions/api/identity/gaia_web_auth_flow.h',
       'browser/extensions/api/identity/identity_api.cc',
       'browser/extensions/api/identity/identity_api.h',
       'browser/extensions/api/identity/identity_mint_queue.cc',
       'browser/extensions/api/identity/identity_mint_queue.h',
       'browser/extensions/api/identity/identity_signin_flow.cc',
       'browser/extensions/api/identity/identity_signin_flow.h',
@@ skipping 613 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/extensions/api/cast_channel/cast_channel.proto' ],
       'variables': {
           'proto_in_dir': 'browser/extensions/api/cast_channel',
           'proto_out_dir': 'chrome/browser/extensions/api/cast_channel',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }