Consolidate the update_client serialization code.

components/update_client/update_engine.cc

 // Copyright 2015 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/update_engine.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 267 matching lines @@
   DCHECK(!queue.empty());
 
   const auto& id = queue.front();
   DCHECK_EQ(1u, update_context->components.count(id));
   const auto& component = update_context->components.at(id);
   DCHECK(component);
 
   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);
     }
 
     queue.pop();
   }
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&UpdateEngine::HandleComponent, base::Unretained(this), it));
 }
@@ skipping 61 matching lines @@
   component->Uninstall(version, reason);
 
   update_context->component_queue.push(id);
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&UpdateEngine::HandleComponent, base::Unretained(this), it));
 }
 
 }  // namespace update_client