Remove unused user email argument from nss_util.

chrome/browser/chromeos/ownership/owner_settings_service.cc

Index: chrome/browser/chromeos/ownership/owner_settings_service.cc
diff --git a/chrome/browser/chromeos/ownership/owner_settings_service.cc b/chrome/browser/chromeos/ownership/owner_settings_service.cc
index 9246a0599dac2f88155c2c4a805f400e2f25dc7a..e7215cf8cda969ae18c5679cc8aee8561c726f55 100644
--- a/chrome/browser/chromeos/ownership/owner_settings_service.cc
+++ b/chrome/browser/chromeos/ownership/owner_settings_service.cc
@@ -376,7 +376,6 @@ void OwnerSettingsService::OwnerKeySet(bool success) {
 
 // static
 void OwnerSettingsService::IsOwnerForSafeModeAsync(
-    const std::string& user_id,
     const std::string& user_hash,
     const scoped_refptr<OwnerKeyUtil>& owner_key_util,
     const IsOwnerCallback& callback) {
@@ -388,7 +387,6 @@ void OwnerSettingsService::IsOwnerForSafeModeAsync(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(base::IgnoreResult(&crypto::InitializeNSSForChromeOSUser),
-                 user_id,
                  user_hash,
                  ProfileHelper::GetProfilePathByUserIdHash(user_hash)),
       base::Bind(&DoesPrivateKeyExistAsync, owner_key_util, callback));