Enable system NSS key slot.

net/cert/nss_cert_database.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_CERT_NSS_CERT_DATABASE_H_
 #define NET_CERT_NSS_CERT_DATABASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 112 matching lines @@
   virtual void ListCerts(const ListCertsCallback& callback);
 
   // Get a list of certificates in the certificate database of the given slot.
   // Note that the callback may be run even after the database is deleted.
   // Must be called on the IO thread and it calls |callback| on the IO thread.
   // This does not block by retrieving the certs asynchronously on a worker
   // thread. Never calls |callback| synchronously.
   virtual void ListCertsInSlot(const ListCertsCallback& callback,
                                PK11SlotInfo* slot);
 
+#if defined(OS_CHROMEOS)
+  // Get the slot for system-wide key data. May be NULL if the system token was
+  // not explicitly set.
+  // Note: The System slot is set after the NSSCertDatabase is constructed and
+  // this call returns synchronously. Thus, it is possible to call this function
+  // before SetSystemSlot is called and get a NULL result.
+  // See https://crbug.com/399554 .
+  virtual crypto::ScopedPK11Slot GetSystemSlot() const;
+#endif
+
   // Get the default slot for public key data.
   crypto::ScopedPK11Slot GetPublicSlot() const;
 
   // Get the default slot for private key or mixed private/public key data.
   crypto::ScopedPK11Slot GetPrivateSlot() const;
 
   // Get the default module for public key data.
   // The returned pointer must be stored in a scoped_refptr<CryptoModule>.
   // DEPRECATED: use GetPublicSlot instead.
   // TODO(mattm): remove usage of this method and remove it.
@@ skipping 148 matching lines @@
   const scoped_refptr<ObserverListThreadSafe<Observer> > observer_list_;
 
   base::WeakPtrFactory<NSSCertDatabase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NSSCertDatabase);
 };
 
 }  // namespace net
 
 #endif  // NET_CERT_NSS_CERT_DATABASE_H_