Add a missing dep of chromeos which was added recently.

chrome/browser/chromeos/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//components/nacl/nacl_defines.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 24 matching lines @@
     "//ui/chromeos/strings",
     "//ui/resources",
     "//ui/strings",
   ]
 
   deps = [
     # TODO(tbarzic): Cleanup this list.
     "//ash",
     "//ash:ash_with_content",
     "//breakpad:client",
+    "//components/login",
     "//components/session_manager/core",
     "//components/user_manager",
     "//chrome/browser/devtools",
     "//chrome/browser/extensions",
     "//chrome/browser/history:in_memory_url_index_cache_proto",
     "//chrome/browser/net:cert_logger_proto",
     "//chrome/browser/safe_browsing:chunk_proto",
     "//chrome/browser/safe_browsing:metadata_proto",
     "//chrome/browser/safe_browsing:report_proto",
     "//chrome/common",
@@ skipping 109 matching lines @@
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
     "attestation/attestation_signed_data.proto",
   ]
 }