Allow re-enrollment to the same domain in case of policy data loss.

chrome/browser/chromeos/login/authenticator.cc

Index: chrome/browser/chromeos/login/authenticator.cc
diff --git a/chrome/browser/chromeos/login/authenticator.cc b/chrome/browser/chromeos/login/authenticator.cc
index 57426b3faed34ad9ab02e41c3e23d33c0ec5cd04..2158c6584acb5a1d3d868037c94a21c84a89f8d8 100644
--- a/chrome/browser/chromeos/login/authenticator.cc
+++ b/chrome/browser/chromeos/login/authenticator.cc
@@ -52,4 +52,16 @@ std::string Authenticator::Sanitize(const std::string& email_address) {
   return sanitized;
 }
 
+// static
+std::string Authenticator::ExtractDomainName(const std::string& email_address) {
+  // First canonicalize which will also verify we have proper domain part.
+  std::string email = Canonicalize(email_address);
+  size_t separator_pos = email.find('@');
+  if (separator_pos != email.npos && separator_pos < email.length() - 1)
+    return email.substr(separator_pos + 1);
+  else
+    NOTREACHED() << "Not a proper email address: " << email;
+  return std::string();
+}
+
 }  // namespace chromeos