Revert "Reland c91b178b07b0d - Delete dead signin code (SigninGlobalError)"

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 419d26552a5027e610fb23452b8f5bab3c654170..020f5f2241e97c30d5565f06c410b9eca0552fae 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1676,7 +1676,10 @@ if (!is_android) {
     }
     if (is_chromeos) {
       deps += [ "//chrome/browser/chromeos:unit_tests" ]
-      sources -= [ "../browser/signin/signin_manager_unittest.cc" ]
+      sources -= [
+        "../browser/signin/signin_global_error_unittest.cc",
+        "../browser/signin/signin_manager_unittest.cc",
+      ]
     }
     if (use_x11) {
       deps += [ "//ui/events/devices" ]