Switch from KeyStore.delKey/saw to KeyStore.delete/list.

KeyStore.delKey was replaced by KeyStore.delete, and KeyStore.saw was
replaced by KeyStore.list.

Bug: 18088752
Change-Id: I45eae9d252dc304f9d8d6fa8bfd1a9729ef090b3
diff --git a/src/com/android/keychain/KeyChainService.java b/src/com/android/keychain/KeyChainService.java
index f67b25f..8a94b19 100644
--- a/src/com/android/keychain/KeyChainService.java
+++ b/src/com/android/keychain/KeyChainService.java
@@ -160,7 +160,7 @@
             if (!mKeyStore.put(Credentials.USER_CERTIFICATE + alias, userCertificate, -1,
                     KeyStore.FLAG_ENCRYPTED)) {
                 Log.e(TAG, "Failed to import user certificate " + userCertificate);
-                if (!mKeyStore.delKey(Credentials.USER_PRIVATE_KEY + alias)) {
+                if (!mKeyStore.delete(Credentials.USER_PRIVATE_KEY + alias)) {
                     Log.e(TAG, "Failed to delete private key after certificate importing failed");
                 }
                 return false;