Use the NSS internal key slot for all temporary key operations

crypto/symmetric_key_nss.cc

Index: crypto/symmetric_key_nss.cc
diff --git a/crypto/symmetric_key_nss.cc b/crypto/symmetric_key_nss.cc
index 6772532ae282356e60a2087ef749b461287c7a0a..7fd0c320d888e3d7bcdfa21337c1c44db0224f13 100644
--- a/crypto/symmetric_key_nss.cc
+++ b/crypto/symmetric_key_nss.cc
@@ -23,7 +23,7 @@ SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm,
   if (key_size_in_bits == 0)
     return NULL;
 
-  ScopedPK11Slot slot(PK11_GetBestSlot(CKM_AES_KEY_GEN, NULL));
+  ScopedPK11Slot slot(PK11_GetInternalSlot());
   if (!slot.get())
     return NULL;
 
@@ -68,7 +68,7 @@ SymmetricKey* SymmetricKey::DeriveKeyFromPassword(Algorithm algorithm,
   if (!alg_id.get())
     return NULL;
 
-  ScopedPK11Slot slot(PK11_GetBestSlot(SEC_OID_PKCS5_PBKDF2, NULL));
+  ScopedPK11Slot slot(PK11_GetInternalSlot());
   if (!slot.get())
     return NULL;
 
@@ -93,7 +93,7 @@ SymmetricKey* SymmetricKey::Import(Algorithm algorithm,
       const_cast<char *>(raw_key.data()));
   key_item.len = raw_key.size();
 
-  ScopedPK11Slot slot(PK11_GetBestSlot(cipher, NULL));
+  ScopedPK11Slot slot(PK11_GetInternalSlot());
   if (!slot.get())
     return NULL;