Implement CUP signing in UpdateClient.

components/update_client/action_update_check.cc

Index: components/update_client/action_update_check.cc
diff --git a/components/update_client/action_update_check.cc b/components/update_client/action_update_check.cc
index 5c411c4932b57ff6f4a1be41b8986552d9e1489b..9e31eb6d33d30f8aa8d43e836ee709e8a53518f9 100644
--- a/components/update_client/action_update_check.cc
+++ b/components/update_client/action_update_check.cc
@@ -96,18 +96,14 @@ void ActionUpdateCheck::Run(UpdateContext* update_context, Callback callback) {
 }
 
 void ActionUpdateCheck::UpdateCheckComplete(
-    const GURL& original_url,
     int error,
-    const std::string& error_message,
     const UpdateResponse::Results& results) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
-  VLOG(1) << "Update check completed from: " << original_url.spec();
-
   if (!error)
     OnUpdateCheckSucceeded(results);
   else
-    OnUpdateCheckFailed(error, error_message);
+    OnUpdateCheckFailed(error);
 }
 
 void ActionUpdateCheck::OnUpdateCheckSucceeded(
@@ -198,8 +194,7 @@ void ActionUpdateCheck::OnUpdateCheckSucceeded(
   UpdateCrx();
 }
 
-void ActionUpdateCheck::OnUpdateCheckFailed(int error,
-                                            const std::string& error_message) {
+void ActionUpdateCheck::OnUpdateCheckFailed(int error) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(error);