[Downloads] Avoid resetting SecureHash state across an interruption.

content/browser/download/base_file.h

 // Copyright (c) 2012 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_DOWNLOAD_BASE_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 57 matching lines @@
 
   // Detach the file so it is not deleted on destruction.
   virtual void Detach();
 
   // Abort the download and automatically close the file.
   void Cancel();
 
   // Indicate that the download has finished. No new data will be received.
   void Finish();
 
+  // Indicate that the download is being aborted due to an error. This is
+  // identical to Finish() with the exception that the hash state will not be
+  // finalized.
+  void FinishWithError();
+
   // Set the client guid which will be used to identify the app to the
   // system AV scanning function. Should be called before
   // AnnotateWithSourceInformation() to take effect.
   void SetClientGuid(const std::string& guid);
 
   // Informs the OS that this file came from the internet. Returns a
   // DownloadInterruptReason indicating the result of the operation.
   // Note: SetClientGuid() should be called before this function on
   // Windows to ensure the correct app client ID is available.
   DownloadInterruptReason AnnotateWithSourceInformation();
@@ skipping 96 matching lines @@
   bool detached_;
 
   net::BoundNetLog bound_net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseFile);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_