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

chrome/browser/chromeos/login/authenticator.h

Index: chrome/browser/chromeos/login/authenticator.h
diff --git a/chrome/browser/chromeos/login/authenticator.h b/chrome/browser/chromeos/login/authenticator.h
index f992d31d2c31fdfb3f9f8a121d7d0e92fda0c186..ab0e2f26791c9a7e87e1f3861c141afe6a82add3 100644
--- a/chrome/browser/chromeos/login/authenticator.h
+++ b/chrome/browser/chromeos/login/authenticator.h
@@ -97,10 +97,16 @@ class Authenticator : public base::RefCountedThreadSafe<Authenticator> {
   // http://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=10313#
   static std::string Canonicalize(const std::string& email_address);
 
+  // Returns the canonical form of the given domain.
+  static std::string CanonicalizeDomain(const std::string& domain);
+
   // Sanitize emails. Currently, it only ensures all emails have a domain by
   // adding gmail.com if no domain is present.
   static std::string Sanitize(const std::string& email_address);
 
+  // Extract the domain part from the canonical form of the given email.
+  static std::string ExtractDomainName(const std::string& email);
+
  protected:
   LoginStatusConsumer* consumer_;
   Profile* authentication_profile_;