Fix build breakage.

Change-Id: I82216379660604eedcd22b22536b385b8aa18c48
diff --git a/samples/Vault/src/com/example/android/vault/VaultProvider.java b/samples/Vault/src/com/example/android/vault/VaultProvider.java
index 597f7d3..02e3211 100644
--- a/samples/Vault/src/com/example/android/vault/VaultProvider.java
+++ b/samples/Vault/src/com/example/android/vault/VaultProvider.java
@@ -38,8 +38,6 @@
 import android.security.KeyChain;
 import android.util.Log;
 
-import com.android.vault.R;
-
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;