Update TPMTokenLoader class comment.

chromeos/tpm_token_loader.h

Index: chromeos/tpm_token_loader.h
diff --git a/chromeos/tpm_token_loader.h b/chromeos/tpm_token_loader.h
index 9ac7a61e61df4adfc9b5636c31771a2c35fcd190..80fbaa2c599ecd55c741ac609282c4017663c1ca 100644
--- a/chromeos/tpm_token_loader.h
+++ b/chromeos/tpm_token_loader.h
@@ -23,11 +23,13 @@ class SequencedTaskRunner;
 
 namespace chromeos {
 
-// This class is responsible for loading the TPM token when the user logs
-// in. It is expected to be constructed on the UI thread and public methods
-// should all be called from the UI thread. When the TPM token is loaded,
-// or if the TPM should stay disabled for the session, the observers are
+// This class is responsible for loading the TPM backed token and system slot

[stevenjb, 2014/07/11 16:30:07]

nit: 'setting the system slot'? I'm not super familiar with TPM semantics, but
one doesn't usually "load" a "slot".

+// when the user logs in. It is expected to be constructed on the UI thread and
+// public methods should all be called from the UI thread. When the TPM token is
+// loaded, or if the TPM should stay disabled for the session, the observers are
 // notified using |OnTPMTokenReady|.
+// Note: This currently loads the hard coded default slot with id 0. See

[stevenjb, 2014/07/11 16:30:07]

Also here, "sets the hard coded default slot to id 0"?

[pneubeck (no reviews), 2014/07/12 09:48:14]

Yeah, the crypto nomenclature takes getting used to. As the slot is the result
type of opening a NSS DB, I think 'setting' wouldn't be correct either.
I'll change it to initializing. 

+// CryptohomeClient::OnPkcs11GetTpmTokenInfo.
 class CHROMEOS_EXPORT TPMTokenLoader : public LoginState::Observer {
  public:
   class Observer {