Consolidate the update_client serialization code.

components/update_client/ping_manager.cc

 // Copyright 2014 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.
 
 #include "components/update_client/ping_manager.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
@@ skipping 49 matching lines @@
 void PingSender::OnRequestSenderComplete(int error,
                                          const std::string& response,
                                          int retry_after_sec) {
   DCHECK(thread_checker_.CalledOnValidThread());
   delete this;
 }
 
 bool PingSender::SendPing(const Component& component) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
+  if (component.events().empty())
+    return false;
+
   auto urls(config_->PingUrl());
   if (component.crx_component().requires_network_encryption)
     RemoveUnsecureUrls(&urls);
 
   if (urls.empty())
     return false;
 
   request_sender_ = base::MakeUnique<RequestSender>(config_);
   request_sender_->Send(
       false, BuildEventPingRequest(*config_, component), urls,
@@ skipping 16 matching lines @@
   auto ping_sender = base::MakeUnique<PingSender>(config_);
   if (!ping_sender->SendPing(component))
     return false;
 
   // The ping sender object self-deletes after sending the ping asynchrously.
   ping_sender.release();
   return true;
 }
 
 }  // namespace update_client