[Athena] Extract Chrome OS authentication stack

chromeos/login/auth/user_context.cc

Index: chromeos/login/auth/user_context.cc
diff --git a/chrome/browser/chromeos/login/auth/user_context.cc b/chromeos/login/auth/user_context.cc
similarity index 96%
rename from chrome/browser/chromeos/login/auth/user_context.cc
rename to chromeos/login/auth/user_context.cc
index 8abe8457b24b1767d3e25f085eee379b463d6ebd..78f12bcb2980e212cfac9c039cf9ae724e2bd076 100644
--- a/chrome/browser/chromeos/login/auth/user_context.cc
+++ b/chromeos/login/auth/user_context.cc
@@ -2,9 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/chromeos/login/auth/user_context.h"
-
-#include "chrome/browser/chromeos/login/helper.h"
+#include "chromeos/login/auth/user_context.h"
+#include "chromeos/login/user_names.h"
 
 namespace chromeos {