Don't destroy a request while it is being processed

chrome/browser/renderer_host/download_throttling_resource_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_THROTTLING_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_THROTTLING_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 40 matching lines @@
                           int min_size);
   virtual bool OnReadCompleted(int request_id, int* bytes_read);
   virtual bool OnResponseCompleted(int request_id,
                                    const net::URLRequestStatus& status,
                                    const std::string& security_info);
   virtual void OnRequestClosed();
 
   // DownloadRequestLimiter::Callback implementation:
   virtual void CancelDownload();
   virtual void ContinueDownload();
-  virtual int GetRequestId();
 
  private:
   virtual ~DownloadThrottlingResourceHandler();
 
   void CopyTmpBufferToDownloadHandler();
 
   ResourceDispatcherHost* host_;
   net::URLRequest* request_;
   GURL url_;
   int render_process_host_id_;
@@ skipping 12 matching lines @@
   // a buffer. This is that buffer.
   scoped_refptr<net::IOBuffer> tmp_buffer_;
   int tmp_buffer_length_;
 
   // If true the next call to OnReadCompleted is ignored. This is used if we're
   // paused during a call to OnReadCompleted. Pausing during OnReadCompleted
   // results in two calls to OnReadCompleted for the same data. This make sure
   // we ignore one of them.
   bool ignore_on_read_complete_;
 
+  // Have we received OnRequestClosed()?  If so, we shouldn't act on
+  // CancelDownload()/ContinueDownload().
+  bool request_closed_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadThrottlingResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_THROTTLING_RESOURCE_HANDLER_H_