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

chrome/browser/chromeos/attestation/attestation_signed_data.proto

Index: chrome/browser/chromeos/attestation/attestation_signed_data.proto
diff --git a/chrome/browser/chromeos/attestation/attestation_signed_data.proto b/chrome/browser/chromeos/attestation/attestation_signed_data.proto
new file mode 100644
index 0000000000000000000000000000000000000000..7377a4d4b1268d6eef72b621bd0469c291c72d32
--- /dev/null
+++ b/chrome/browser/chromeos/attestation/attestation_signed_data.proto
@@ -0,0 +1,17 @@
+// 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;
+}