[Resumption 8/11] Remove intermediate files when no longer necessary.

content/browser/download/download_manager_impl.cc

 // 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.
 
 #include "content/browser/download/download_manager_impl.h"
 
 #include <iterator>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 371 matching lines @@
   DownloadId id(info->download_id);
   const bool new_download = !id.IsValid();
   DownloadItemImpl* download = NULL;
 
   if (new_download) {
     id = GetNextId();
     download = CreateActiveItem(id, *info);
   } else {
     DownloadMap::iterator item_iterator = downloads_.find(id.local());
     // Trying to resume an interrupted download.
-    if (item_iterator == downloads_.end()) {
+    if (item_iterator == downloads_.end() ||
+        item_iterator->second->IsCancelled()) {
       // If the download is no longer known to the DownloadManager, then it was
-      // removed after it was resumed. Ignore.
+      // removed after it was resumed. Ignore. If the download is cancelled
+      // while resuming, then also ignore the request.
       info->request_handle.CancelRequest();
       return NULL;
     }
     download = item_iterator->second;
     DCHECK(download->IsInterrupted());
   }
 
   base::FilePath default_download_directory;
   if (delegate_) {
     base::FilePath website_save_directory;  // Unused
@@ skipping 258 matching lines @@
   if (delegate_)
     delegate_->OpenDownload(download);
 }
 
 void DownloadManagerImpl::ShowDownloadInShell(DownloadItemImpl* download) {
   if (delegate_)
     delegate_->ShowDownloadInShell(download);
 }
 
 }  // namespace content