cryptohome: Move Encrypt/DecryptWithSystemSalt() out of CryptohomeLibrary

chromeos/cryptohome/cryptohome_library.h

Index: chromeos/cryptohome/cryptohome_library.h
diff --git a/chromeos/cryptohome/cryptohome_library.h b/chromeos/cryptohome/cryptohome_library.h
index 2de89b458a4248e360da90f326d32938e81dd6fb..1f84136cd488c7637d3166b6e968b1c02d1b2b42 100644
--- a/chromeos/cryptohome/cryptohome_library.h
+++ b/chromeos/cryptohome/cryptohome_library.h
@@ -38,16 +38,6 @@ class CHROMEOS_EXPORT CryptohomeLibrary {
   // calling function to try again after a delay if desired.
   virtual std::string GetSystemSalt() = 0;
 
-  // Encrypts |token| with the system salt key (stable for the lifetime
-  // of the device).  Useful to avoid storing plain text in place like
-  // Local State.
-  virtual std::string EncryptWithSystemSalt(const std::string& token) = 0;
-
-  // Decrypts |token| with the system salt key (stable for the lifetime
-  // of the device).
-  virtual std::string DecryptWithSystemSalt(
-      const std::string& encrypted_token_hex) = 0;
-
  protected:
   CryptohomeLibrary();