Remove unused import.

Missed the cleanup step from previous CL.

Test: it builds
Change-Id: I62494994731189f962ca2dd26a7c3283784792ed
diff --git a/src/com/android/settings/ConfirmDeviceCredentialBaseFragment.java b/src/com/android/settings/ConfirmDeviceCredentialBaseFragment.java
index a5aa5b4..a2e9fe9 100644
--- a/src/com/android/settings/ConfirmDeviceCredentialBaseFragment.java
+++ b/src/com/android/settings/ConfirmDeviceCredentialBaseFragment.java
@@ -39,7 +39,6 @@
 import android.os.Handler;
 import android.os.RemoteException;
 import android.os.UserManager;
-import android.security.KeyStore;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;