Update installed ServiceWorkers.

content/browser/service_worker/service_worker_version.cc

 // Copyright 2013 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 "content/browser/service_worker/service_worker_version.h"
 
 #include "base/command_line.h"
 #include "base/stl_util.h"
 #include "base/strings/string16.h"
 #include "content/browser/service_worker/embedded_worker_instance.h"
@@ skipping 199 matching lines @@
                  weak_factory_.GetWeakPtr()));
 }
 
 void ServiceWorkerVersion::DeferScheduledUpdate() {
   if (update_timer_.IsRunning())
     update_timer_.Reset();
 }
 
 void ServiceWorkerVersion::StartUpdate() {
   update_timer_.Stop();
-  // TODO(michaeln): write me
+  if (!context_)
+    return;
+  ServiceWorkerRegistration* registration =
+      context_->GetLiveRegistration(registration_id_);
+  if (!registration)
+    return;
+  context_->UpdateServiceWorker(registration);
 }
 
 void ServiceWorkerVersion::SendMessage(
     const IPC::Message& message, const StatusCallback& callback) {
   if (running_status() != RUNNING) {
     // Schedule calling this method after starting the worker.
     StartWorker(base::Bind(&RunTaskAfterStartWorker,
                            weak_factory_.GetWeakPtr(), callback,
                            base::Bind(&self::SendMessage,
                                       weak_factory_.GetWeakPtr(),
@@ skipping 151 matching lines @@
 
 void ServiceWorkerVersion::RemoveControllee(
     ServiceWorkerProviderHost* provider_host) {
   ControlleeMap::iterator found = controllee_map_.find(provider_host);
   DCHECK(found != controllee_map_.end());
   controllee_by_id_.Remove(found->second);
   controllee_map_.erase(found);
   RemoveProcessFromWorker(provider_host->process_id());
   if (HasControllee())
     return;
+  FOR_EACH_OBSERVER(Listener, listeners_, OnNoControllees(this));
   if (is_doomed_) {
     DoomInternal();
     return;
   }
   ScheduleStopWorker();
 }
 
 void ServiceWorkerVersion::AddPotentialControllee(
     ServiceWorkerProviderHost* provider_host) {
   AddProcessToWorker(provider_host->process_id());
@@ skipping 271 matching lines @@
   SetStatus(REDUNDANT);
   StopWorker(base::Bind(&ServiceWorkerUtils::NoOpStatusCallback));
   if (!context_)
     return;
   std::vector<ServiceWorkerDatabase::ResourceRecord> resources;
   script_cache_map_.GetResources(&resources);
   context_->storage()->PurgeResources(resources);
 }
 
 }  // namespace content