Don't prematurely delete script resources when registration is deleted

content/browser/service_worker/service_worker_handle.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 10 matching lines @@
 
 class ServiceWorkerContextCore;
 class ServiceWorkerRegistration;
 
 // Roughly corresponds to one ServiceWorker object in the renderer process
 // (WebServiceWorkerImpl).
 // Has references to the corresponding ServiceWorkerVersion and
 // ServiceWorkerRegistration (therefore they're guaranteed to be alive while
 // this handle is around).
 class CONTENT_EXPORT ServiceWorkerHandle
-    : public ServiceWorkerVersion::Listener {
+    : NON_EXPORTED_BASE(public ServiceWorkerVersion::Listener) {
  public:
   // Creates a handle for a live version. The version's corresponding
   // registration must be also alive.
   // This may return NULL if |context|.get() or |version| is NULL.
   // |sender| and |thread_id| will be used to send messages to the
   // corresponding WebServiceWorkerImpl (which should live on |thread_id|
   // in the child process).
   static scoped_ptr<ServiceWorkerHandle> Create(
       base::WeakPtr<ServiceWorkerContextCore> context,
       IPC::Sender* sender,
@@ skipping 41 matching lines @@
   int ref_count_;  // Created with 1.
   scoped_refptr<ServiceWorkerRegistration> registration_;
   scoped_refptr<ServiceWorkerVersion> version_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerHandle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_