Add a callback parameter to UpdateClient::SendUninstallPing.

components/update_client/update_client.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/update_client.h"
 
 #include <algorithm>
 #include <queue>
 #include <set>
 #include <utility>
@@ skipping 216 matching lines @@
   // task runner yet.
   while (!task_queue_.empty()) {
     auto* task(task_queue_.front());
     task_queue_.pop();
     task->Cancel();
   }
 }
 
 void UpdateClientImpl::SendUninstallPing(const std::string& id,
                                          const base::Version& version,
-                                         int reason) {
+                                         int reason,
+                                         const Callback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // The implementation of PingManager::SendPing contains a self-deleting
   // object responsible for sending the ping.
   CrxUpdateItem item;
   item.state = CrxUpdateItem::State::kUninstalled;
   item.id = id;
   item.previous_version = version;
   item.next_version = base::Version("0");
   item.extra_code1 = reason;
 
   ping_manager_->SendPing(&item);
+
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(callback, Error::NONE));
 }
 
 scoped_refptr<UpdateClient> UpdateClientFactory(
     const scoped_refptr<Configurator>& config) {
   std::unique_ptr<PingManager> ping_manager(new PingManager(config));
   return new UpdateClientImpl(config, std::move(ping_manager),
                               &UpdateChecker::Create, &CrxDownloader::Create);
 }
 
 void RegisterPrefs(PrefRegistrySimple* registry) {
   PersistedData::RegisterPrefs(registry);
 }
 
 }  // namespace update_client