Added GetSanitizedUsername() method to CryptohomeClient.

chromeos/dbus/cryptohome_client.h

Index: chromeos/dbus/cryptohome_client.h
diff --git a/chromeos/dbus/cryptohome_client.h b/chromeos/dbus/cryptohome_client.h
index 0ace6508a93cdc40fb141e40b58856a28b422ccf..9d94d46cb28212996cbbcc720dfad92f91f7a6a0 100644
--- a/chromeos/dbus/cryptohome_client.h
+++ b/chromeos/dbus/cryptohome_client.h
@@ -90,6 +90,12 @@ class CHROMEOS_EXPORT CryptohomeClient {
   // The original content of |salt| is lost.
   virtual bool GetSystemSalt(std::vector<uint8>* salt) = 0;
 
+  // Calls GetSanitizedUsername method.  |callback| is called after the method
+  // call succeeds.
+  virtual void GetSanitizedUsername(
+      const std::string& username,
+      const StringDBusMethodCallback& callback) = 0;
+
   // Calls the AsyncMount method to asynchronously mount the cryptohome for
   // |username|, using |key| to unlock it. For supported |flags|, see the
   // documentation of AsyncMethodCaller::AsyncMount().