Disable fingerprint for secondary users.

Bug: 875540
Change-Id: I9825bb9cefb642ed8e3e4bd3587e065f026eb923
Reviewed-on: https://chromium-review.googlesource.com/1194980Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587292}

chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc

@@ -101,6 +101,11 @@ bool IsFingerprintEnabled() {
   if (enable_for_testing_)
     return true;
 
+  // Disable fingerprint for secondary user.
+  user_manager::UserManager* user_manager = user_manager::UserManager::Get();
+  if (user_manager->GetActiveUser() != user_manager->GetPrimaryUser())
+    return false;
+
   // Enable fingerprint unlock only if the switch is present.
   return base::FeatureList::IsEnabled(features::kQuickUnlockFingerprint);
 }