Use process-per-app-instance for hosted apps without background permission.

content/browser/site_instance.cc

 // Copyright (c) 2011 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/site_instance.h"
 
 #include "content/browser/browsing_instance.h"
 #include "content/browser/content_browser_client.h"
 #include "content/browser/renderer_host/browser_render_process_host.h"
 #include "content/browser/webui/web_ui_factory.h"
@@ skipping 24 matching lines @@
       process_(NULL),
       max_page_id_(-1),
       has_site_(false) {
   DCHECK(browsing_instance);
 
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
                  NotificationService::AllSources());
 }
 
 SiteInstance::~SiteInstance() {
+  NotificationService::current()->Notify(
+      content::NOTIFICATION_SITE_INSTANCE_DELETED,
+      Source<SiteInstance>(this),
+      NotificationService::NoDetails());
+
   // Now that no one is referencing us, we can safely remove ourselves from
   // the BrowsingInstance.  Any future visits to a page from this site
   // (within the same BrowsingInstance) can safely create a new SiteInstance.
   if (has_site_)
     browsing_instance_->UnregisterSiteInstance(this);
 }
 
 bool SiteInstance::HasProcess() const {
   return (process_ != NULL);
 }
@@ skipping 178 matching lines @@
 }
 
 void SiteInstance::Observe(int type,
                            const NotificationSource& source,
                            const NotificationDetails& details) {
   DCHECK(type == content::NOTIFICATION_RENDERER_PROCESS_TERMINATED);
   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
   if (rph == process_)
     process_ = NULL;
 }