Fix a crash where the ResourceMessageFilter is deleted

chrome/browser/renderer_host/safe_browsing_resource_handler.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_SAFE_BROWSING_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_SAFE_BROWSING_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "base/time.h"
+#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "chrome/browser/renderer_host/resource_handler.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
-
-class ResourceDispatcherHost;
+#include "chrome/common/notification_observer.h"
 
 // Checks that a url is safe.
 class SafeBrowsingResourceHandler : public ResourceHandler,
-                                    public SafeBrowsingService::Client {
+                                    public SafeBrowsingService::Client,
+                                    public NotificationObserver {
  public:
   SafeBrowsingResourceHandler(ResourceHandler* handler,
                               int render_process_host_id,
                               int render_view_id,
                               const GURL& url,
                               ResourceType::Type resource_type,
                               SafeBrowsingService* safe_browsing,
-                              ResourceDispatcherHost* resource_dispatcher_host);
+                              ResourceDispatcherHost* resource_dispatcher_host,
+                              ResourceDispatcherHost::Receiver* receiver);
   ~SafeBrowsingResourceHandler();
 
   // ResourceHandler implementation:
   bool OnUploadProgress(int request_id, uint64 position, uint64 size);
   bool OnRequestRedirected(int request_id, const GURL& new_url);
   bool OnResponseStarted(int request_id, ResourceResponse* response);
   void OnGetHashTimeout();
   bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
                   int min_size);
   bool OnReadCompleted(int request_id, int* bytes_read);
   bool OnResponseCompleted(int request_id,
                            const URLRequestStatus& status,
                            const std::string& security_info);
 
   // SafeBrowsingService::Client implementation, called on the IO thread once
   // the URL has been classified.
   void OnUrlCheckResult(const GURL& url,
                         SafeBrowsingService::UrlCheckResult result);
 
   // SafeBrowsingService::Client implementation, called on the IO thread when
   // the user has decided to proceed with the current request, or go back.
   void OnBlockingPageComplete(bool proceed);
 
+  // NotificationObserver interface.
+  void Observe(NotificationType type,
+               const NotificationSource& source,
+               const NotificationDetails& details);
+
  private:
   scoped_refptr<ResourceHandler> next_handler_;
   int render_process_host_id_;
   int render_view_id_;
   int paused_request_id_;  // -1 if not paused
   bool in_safe_browsing_check_;
   bool displaying_blocking_page_;
   SafeBrowsingService::UrlCheckResult safe_browsing_result_;
   scoped_refptr<SafeBrowsingService> safe_browsing_;
   scoped_ptr<URLRequestStatus> queued_error_;
   std::string queued_security_info_;
   int queued_error_request_id_;
   ResourceDispatcherHost* rdh_;
   base::Time pause_time_;
   ResourceType::Type resource_type_;
+  ResourceDispatcherHost::Receiver* receiver_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingResourceHandler);
 };
 
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_SAFE_BROWSING_RESOURCE_HANDLER_H_