AU: Fix potential issues with premature destruction of HTTP fetchers.

download_action.h

 // Copyright (c) 2009 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_DOWNLOAD_ACTION_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_DOWNLOAD_ACTION_H__
 
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ skipping 70 matching lines @@
 
   // Debugging/logging
   static std::string StaticType() { return "DownloadAction"; }
   std::string Type() const { return StaticType(); }
 
   // HttpFetcherDelegate methods (see http_fetcher.h)
   virtual void ReceivedBytes(HttpFetcher *fetcher,
                              const char* bytes, int length);
   virtual void SeekToOffset(off_t offset);
   virtual void TransferComplete(HttpFetcher *fetcher, bool successful);
+  virtual void TransferTerminated(HttpFetcher *fetcher);
 
   DownloadActionDelegate* delegate() const { return delegate_; }
   void set_delegate(DownloadActionDelegate* delegate) {
     delegate_ = delegate;
   }
 
   HttpFetcher* http_fetcher() { return http_fetcher_.get(); }
 
  private:
   // The InstallPlan passed in
@@ skipping 16 matching lines @@
 
   // Used to apply a delta update:
   scoped_ptr<DeltaPerformer> delta_performer_;
 
   // Pointer to the HttpFetcher that does the http work.
   scoped_ptr<HttpFetcher> http_fetcher_;
 
   // Used to find the hash of the bytes downloaded
   OmahaHashCalculator omaha_hash_calculator_;
 
+  // Used by TransferTerminated to figure if this action terminated itself or
+  // was terminated by the action processor.
+  ActionExitCode code_;
+
   // For reporting status to outsiders
   DownloadActionDelegate* delegate_;
   uint64_t bytes_received_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadAction);
 };
 
 // We want to be sure that we're compiled with large file support on linux,
 // just in case we find ourselves downloading large images.
 COMPILE_ASSERT(8 == sizeof(off_t), off_t_not_64_bit);
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_DOWNLOAD_ACTION_H__