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

components/login/BUILD.gn

 # 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.
 
 component("login") {
   sources = [
     "base_screen_handler_utils.cc",
     "base_screen_handler_utils.h",
     "localized_values_builder.cc",
     "localized_values_builder.h",
     "screens/screen_context.cc",
     "screens/screen_context.h",
   ]
 
   defines = [ "LOGIN_IMPLEMENTATION" ]
 
   deps = [
     "//ui/base",
-    "//components/signin/core/account_id",
   ]
 
   public_deps = [
     "//base",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "screens/screen_context_unittest.cc",
   ]
 
   deps = [
     ":login",
     "//base",
     "//testing/gtest",
   ]
 }