[Chrome OS] Refactor Canonicalize() method into base class to prepare for new Authenticator subclass

chrome/browser/chromeos/login/google_authenticator.h

Index: chrome/browser/chromeos/login/google_authenticator.h
diff --git a/chrome/browser/chromeos/login/google_authenticator.h b/chrome/browser/chromeos/login/google_authenticator.h
index be3662fa15c0f95dd63a7cb0c3b4eae3145c9522..7c71952860df1d0d7f073f170c03631c1bab43d0 100644
--- a/chrome/browser/chromeos/login/google_authenticator.h
+++ b/chrome/browser/chromeos/login/google_authenticator.h
@@ -85,12 +85,6 @@ class GoogleAuthenticator : public Authenticator, public GaiaAuthConsumer {
   void ResyncEncryptedData(
       const GaiaAuthConsumer::ClientLoginResult& credentials);
 
-  // Perform basic canonicalization of |email_address|, taking into account
-  // that gmail does not consider '.' or caps inside a username to matter.
-  // For example, c.masone@gmail.com == cMaSone@gmail.com, per
-  // http://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=10313#
-  static std::string Canonicalize(const std::string& email_address);
-
   // Callbacks from GaiaAuthenticator2
   virtual void OnClientLoginFailure(
       const GoogleServiceAuthError& error);