ScreenContext is moved to components/login.

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.
 
-source_set("auto_login_parser") {
+component("login") {
   sources = [
-    "auto_login_parser.cc",
-    "auto_login_parser.h",
+    "base_screen_handler_utils.cc",
+    "base_screen_handler_utils.h",
+    "screens/screen_context.cc",
+    "screens/screen_context.h",
+  ]
+
+  defines = [
+    "LOGIN_IMPLEMENTATION"
   ]
 
   deps = [
     "//base",
-    "//net",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
-  sources = [
-    "auto_login_parser_unittest.cc",
-  ]
+  sources = ["screens/screen_context_unittest.cc"]
 
   deps = [
-    ":auto_login_parser",
+    ":login",
     "//testing/gtest",
   ]
 }