Do a better job at faking simple challenge signatures.

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index 9552beeeda02b4a90ba0502d3de51871eccd0405..4d4267e93a8ec6957b9e7c7e94b96bff49319efc 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -49,6 +49,7 @@ source_set("chromeos") {
     "//chrome/common/safe_browsing:proto",
     "//chrome/installer/util:with_no_strings",
     "//chromeos",
+    "//chromeos:attestation_proto",
     "//chromeos:cryptohome_proto",
     "//chromeos:cryptohome_signkey_proto",
     "//chromeos:power_manager_proto",
@@ -1596,6 +1597,5 @@ proto_library("device_policy_proto") {
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
-    "attestation/attestation_signed_data.proto",
   ]
 }