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 46921f40872f31b03385e2a1bd2498528a635c74..673e3623c7abbff8adb7644e4d3237b93fcc5b4b 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -50,6 +50,7 @@ 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",
@@ -1364,6 +1365,5 @@ proto_library("device_policy_proto") {
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
-    "attestation/attestation_signed_data.proto",
   ]
 }