Enable system NSS key slot.

chrome/browser/net/nss_context.h

Index: chrome/browser/net/nss_context.h
diff --git a/chrome/browser/net/nss_context.h b/chrome/browser/net/nss_context.h
index 33023c0012cd92621a56c4f78dc9401ee0b78646..8212ee14383be835be04d6482e098d3bd8b4604c 100644
--- a/chrome/browser/net/nss_context.h
+++ b/chrome/browser/net/nss_context.h
@@ -46,6 +46,14 @@ net::NSSCertDatabase* GetNSSCertDatabaseForResourceContext(
     const base::Callback<void(net::NSSCertDatabase*)>& callback)
     WARN_UNUSED_RESULT;
 
+#if defined(OS_CHROMEOS)
+// Enables the system key slot in the NSSCertDatabase for the user associated
+// with |context|.
+// Must be called only on the IO thread.
+void EnableNSSSystemKeySlotForResourceContext(
+    content::ResourceContext* context);
+#endif
+
 // Gets a pointer to the NSSCertDatabase for the user associated with |context|.
 // It's a wrapper around |GetNSSCertDatabaseForResourceContext| which makes
 // sure it's called on IO thread (with |profile|'s resource context). The