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

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index 4be0f74e962643568eceed30095aa89af5179832..2ef8e63e90b66fad41c092cee463192d77f4bba0 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -95,10 +95,6 @@ ExtensionProcessManager::ExtensionProcessManager(Profile* profile)
                  Source<Profile>(original_profile));
   registrar_.Add(this, NotificationType::EXTENSION_HOST_DESTROYED,
                  Source<Profile>(profile));
-  registrar_.Add(this, NotificationType::RENDERER_PROCESS_TERMINATED,
-                 NotificationService::AllSources());
-  registrar_.Add(this, NotificationType::RENDERER_PROCESS_CLOSED,
-                 NotificationService::AllSources());
   registrar_.Add(this, NotificationType::APP_TERMINATING,
                  NotificationService::AllSources());
 }
@@ -220,30 +216,6 @@ ExtensionHost* ExtensionProcessManager::GetBackgroundHostForExtension(
   return NULL;
 }
 
-void ExtensionProcessManager::RegisterExtensionProcess(
-    const std::string& extension_id, int process_id) {
-  // TODO(mpcomplete): This is the only place we actually read process_ids_.
-  // Is it necessary?
-  ProcessIDMap::const_iterator it = process_ids_.find(extension_id);
-  if (it != process_ids_.end() && (*it).second == process_id)
-    return;
-
-  // Extension ids should get removed from the map before the process ids get
-  // reused from a dead renderer.
-  DCHECK(it == process_ids_.end());
-  process_ids_[extension_id] = process_id;
-}
-
-void ExtensionProcessManager::UnregisterExtensionProcess(int process_id) {
-  ProcessIDMap::iterator it = process_ids_.begin();
-  while (it != process_ids_.end()) {
-    if (it->second == process_id)
-      process_ids_.erase(it++);
-    else
-      ++it;
-  }
-}
-
 RenderProcessHost* ExtensionProcessManager::GetExtensionProcess(
     const GURL& url) {
   if (!browsing_instance_->HasSiteInstance(url))
@@ -312,13 +284,6 @@ void ExtensionProcessManager::Observe(NotificationType type,
       break;
     }
 
-    case NotificationType::RENDERER_PROCESS_TERMINATED:
-    case NotificationType::RENDERER_PROCESS_CLOSED: {
-      RenderProcessHost* host = Source<RenderProcessHost>(source).ptr();
-      UnregisterExtensionProcess(host->id());
-      break;
-    }
-
     case NotificationType::APP_TERMINATING: {
       // Close background hosts when the last browser is closed so that they
       // have time to shutdown various objects on different threads. Our