[Proximity Auth] Create one ProximityAuthClient per profile, rather than one global one.

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 1462 matching lines @@
       'browser/renderer_context_menu/context_menu_content_type_platform_app.h',
       'browser/renderer_host/chrome_extension_message_filter.cc',
       'browser/renderer_host/chrome_extension_message_filter.h',
       'browser/search/hotword_audio_history_handler.cc',
       'browser/search/hotword_audio_history_handler.h',
       'browser/search/hotword_client.h',
       'browser/search/hotword_service.cc',
       'browser/search/hotword_service.h',
       'browser/search/hotword_service_factory.cc',
       'browser/search/hotword_service_factory.h',
+      'browser/signin/chrome_proximity_auth_client.cc',
+      'browser/signin/chrome_proximity_auth_client.h',
       'browser/signin/easy_unlock_app_manager.cc',
       'browser/signin/easy_unlock_app_manager.h',
       'browser/signin/easy_unlock_auth_attempt.cc',
       'browser/signin/easy_unlock_auth_attempt.h',
       'browser/signin/easy_unlock_metrics.cc',
       'browser/signin/easy_unlock_metrics.h',
       'browser/signin/easy_unlock_screenlock_state_handler.cc',
       'browser/signin/easy_unlock_screenlock_state_handler.h',
       'browser/signin/easy_unlock_service.cc',
       'browser/signin/easy_unlock_service.h',
@@ skipping 2557 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' ]
         },
       ],
     },],
   ],
 }