Change URL back to the previous one if the typed URL causes file download....

chrome/browser/renderer_host/buffered_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_BUFFERED_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "chrome/browser/renderer_host/resource_handler.h"
 
 class ResourceDispatcherHost;
 class URLRequest;
 
 // Used to buffer a request until enough data has been received.
 class BufferedResourceHandler : public ResourceHandler {
  public:
   BufferedResourceHandler(ResourceHandler* handler,
                           ResourceDispatcherHost* host,
-                          URLRequest* request);
+                          URLRequest* request,
+                          int render_process_host_id,
+                          int render_view_id);
 
   // 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);
   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,
@@ skipping 10 matching lines @@
   // Returns true if there is enough information to process the DocType.
   bool DidBufferEnough(int bytes_read);
 
   // Returns true if we have to keep buffering data.
   bool KeepBuffering(int bytes_read);
 
   // Sends a pending OnResponseStarted notification. |in_complete| is true if
   // this is invoked from |OnResponseCompleted|.
   bool CompleteResponseStarted(int request_id, bool in_complete);
 
+  // Notifies TabContents that the resource request resulted in download.
+  void NotifyDownload();
+
   scoped_refptr<ResourceHandler> real_handler_;
   scoped_refptr<ResourceResponse> response_;
   ResourceDispatcherHost* host_;
   URLRequest* request_;
+  int render_process_host_id_;
+  int render_view_id_;
   scoped_refptr<net::IOBuffer> read_buffer_;
   scoped_refptr<net::IOBuffer> my_buffer_;
   int read_buffer_size_;
   int bytes_read_;
   bool sniff_content_;
   bool should_buffer_;
   bool buffering_;
   bool finished_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferedResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_