Revert of Do a better job at faking simple challenge signatures.

chromeos/dbus/proto/attestation.proto

Index: chromeos/dbus/proto/attestation.proto
diff --git a/chromeos/dbus/proto/attestation.proto b/chromeos/dbus/proto/attestation.proto
deleted file mode 100644
index 7377a4d4b1268d6eef72b621bd0469c291c72d32..0000000000000000000000000000000000000000
--- a/chromeos/dbus/proto/attestation.proto
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package chromeos.attestation;
-
-// The message used by the attestation service for challenge response.
-message SignedData {
-  // The data which was signed.
-  optional bytes data = 1;
-  // The signature of the data field.
-  optional bytes signature = 2;
-}