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

This broke OSX. Revert for now (hopefully before branch point) and try again later.

BUG=523421
[email protected],[email protected]

Review URL: https://codereview.chromium.org/1304393002

Cr-Commit-Position: refs/heads/master@{#344904}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index b59adef..37307c5 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -507,6 +507,11 @@
                            ".",
                            "//chrome")
     deps += [ "//chrome/browser/chromeos" ]
+  } else {
+    # Non-ChromeOS.
+    sources += rebase_path(gypi_values.chrome_browser_non_chromeos_sources,
+                           ".",
+                           "//chrome")
   }
 
   if (is_ios) {