Reland of This CL replaces e-mail with AccountId on user selection screen.

components/login.gypi

 # Copyright 2014 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': 'login',
     'type': '<(component)',
     'dependencies': [
       '<(DEPTH)/base/base.gyp:base',
+      '<(DEPTH)/components/components.gyp:signin_core_account_id',
       '<(DEPTH)/ui/base/ui_base.gyp:ui_base',
     ],
     'export_dependent_settings': [
       '<(DEPTH)/base/base.gyp:base',
     ],
     'defines': [
       'LOGIN_IMPLEMENTATION',
     ],
     'sources': [
       'login/base_screen_handler_utils.cc',
       'login/base_screen_handler_utils.h',
       'login/localized_values_builder.cc',
       'login/localized_values_builder.h',
       'login/screens/screen_context.cc',
       'login/screens/screen_context.h',
     ],
   }],
 }