Remove usage of singleton software_slot_ in nss on ChromeOS

crypto/nss_util.h

Index: crypto/nss_util.h
diff --git a/crypto/nss_util.h b/crypto/nss_util.h
index e94c4f6daca5663b0ef6e2a19d0fedee33457d7d..4f8a1d679b803dabdf2249e621af41eac547e465 100644
--- a/crypto/nss_util.h
+++ b/crypto/nss_util.h
@@ -95,11 +95,6 @@ CRYPTO_EXPORT void LoadNSSLibraries();
 bool CheckNSSVersion(const char* version);
 
 #if defined(OS_CHROMEOS)
-// Open the r/w nssdb that's stored inside the user's encrypted home
-// directory.  This is the default slot returned by
-// GetPublicNSSKeySlot().
-CRYPTO_EXPORT void OpenPersistentNSSDB();
-
 // Indicates that NSS should load the Chaps library so that we
 // can access the TPM through NSS.  Once this is called,
 // GetPrivateNSSKeySlot() will return the TPM slot if one was found.