Don't prematurely delete script resources when registration is deleted

content/browser/service_worker/service_worker_version.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 56 matching lines @@
     INSTALLING,  // Install event is dispatched and being handled.
     INSTALLED,   // Install event is finished and is ready to be activated.
     ACTIVATING,  // Activate event is dispatched and being handled.
     ACTIVE,      // Activation is finished and can run as active.
     REDUNDANT,   // The version is no longer running as active, due to
                  // unregistration or replace.
   };
 
   class Listener {
    public:
-    virtual void OnWorkerStarted(ServiceWorkerVersion* version) = 0;
-    virtual void OnWorkerStopped(ServiceWorkerVersion* version) = 0;
-    virtual void OnVersionStateChanged(ServiceWorkerVersion* version) = 0;
+    virtual void OnWorkerStarted(ServiceWorkerVersion* version) {};
+    virtual void OnWorkerStopped(ServiceWorkerVersion* version) {};
+    virtual void OnVersionStateChanged(ServiceWorkerVersion* version) {};
     virtual void OnErrorReported(ServiceWorkerVersion* version,
                                  const base::string16& error_message,
                                  int line_number,
                                  int column_number,
-                                 const GURL& source_url) = 0;
+                                 const GURL& source_url) {};
     virtual void OnReportConsoleMessage(ServiceWorkerVersion* version,
                                         int source_identifier,
                                         int message_level,
                                         const base::string16& message,
                                         int line_number,
-                                        const GURL& source_url) = 0;
+                                        const GURL& source_url) {};
+    virtual void OnNoControllees(ServiceWorkerVersion* version) {};
   };
 
   ServiceWorkerVersion(
       ServiceWorkerRegistration* registration,
       int64 version_id,
       base::WeakPtr<ServiceWorkerContextCore> context);
 
   int64 version_id() const { return version_id_; }
   int64 registration_id() const { return registration_id_; }
   const GURL& script_url() const { return script_url_; }
@@ skipping 189 matching lines @@
   base::OneShotTimer<ServiceWorkerVersion> update_timer_;
 
   base::WeakPtrFactory<ServiceWorkerVersion> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerVersion);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_