Consolidate the update_client serialization code.

components/update_client/update_engine.cc

Index: components/update_client/update_engine.cc
diff --git a/components/update_client/update_engine.cc b/components/update_client/update_engine.cc
index f56793f78bd9a1c99cf5737d061a52213ff89418..ef4db8eaf93886b46fd6c158768076d1899d6248 100644
--- a/components/update_client/update_engine.cc
+++ b/components/update_client/update_engine.cc
@@ -285,8 +285,7 @@ void UpdateEngine::HandleComponentComplete(const UpdateContextIterator& it) {
   if (component->IsHandled()) {
     (*it)->next_update_delay = component->GetUpdateDuration();
 
-    // Only ping when the server response included an update for this component.
-    if (component->CanPing()) {
+    if (!component->events().empty()) {
       ping_manager_->SendPing(*component);
     }