Shut down the ServiceWorker system as the browser's shutting down.

content/browser/service_worker/service_worker_process_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 "content/browser/service_worker/service_worker_process_manager.h"
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/site_instance.h"
@@ skipping 33 matching lines @@
 
 ServiceWorkerProcessManager::~ServiceWorkerProcessManager() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(browser_context_ == NULL)
       << "Call Shutdown() before destroying |this|, so that racing method "
       << "invocations don't use a destroyed BrowserContext.";
 }
 
 void ServiceWorkerProcessManager::Shutdown() {
   browser_context_ = NULL;
+  for (std::map<int, ProcessInfo>::const_iterator it = instance_info_.begin();
+       it != instance_info_.end();
+       ++it) {
+    RenderProcessHost* rph = RenderProcessHost::FromID(it->second.process_id);
+    DCHECK(rph);
+    static_cast<RenderProcessHostImpl*>(rph)->DecrementWorkerRefCount();
+  }
+  instance_info_.clear();
 }
 
 void ServiceWorkerProcessManager::AllocateWorkerProcess(
     int embedded_worker_id,
     const std::vector<int>& process_ids,
     const GURL& script_url,
     const base::Callback<void(ServiceWorkerStatusCode, int process_id)>&
         callback) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
     BrowserThread::PostTask(
@@ skipping 76 matching lines @@
         base::Bind(&ServiceWorkerProcessManager::ReleaseWorkerProcess,
                    weak_this_,
                    embedded_worker_id));
     return;
   }
   if (process_id_for_test_ != -1) {
     // Unittests don't increment or decrement the worker refcount of a
     // RenderProcessHost.
     return;
   }
+  if (browser_context_ == NULL) {
+    // Shutdown already released all instances.
+    DCHECK(instance_info_.empty());
+    return;
+  }
   std::map<int, ProcessInfo>::iterator info =
       instance_info_.find(embedded_worker_id);
   DCHECK(info != instance_info_.end());
   RenderProcessHost* rph = NULL;
   if (info->second.site_instance) {
     rph = info->second.site_instance->GetProcess();
     DCHECK_EQ(info->second.process_id, rph->GetID())
         << "A SiteInstance's process shouldn't get destroyed while we're "
            "holding a reference to it. Was the reference actually held?";
   } else {
@@ skipping 11 matching lines @@
 namespace base {
 // Destroying ServiceWorkerProcessManagers only on the UI thread allows the
 // member WeakPtr to safely guard the object's lifetime when used on that
 // thread.
 void DefaultDeleter<content::ServiceWorkerProcessManager>::operator()(
     content::ServiceWorkerProcessManager* ptr) const {
   content::BrowserThread::DeleteSoon(
       content::BrowserThread::UI, FROM_HERE, ptr);
 }
 }  // namespace base