Preliminary work on resuming downloads whose connections have expired.

chrome/browser/cocoa/download_item_controller.mm

Index: chrome/browser/cocoa/download_item_controller.mm
diff --git a/chrome/browser/cocoa/download_item_controller.mm b/chrome/browser/cocoa/download_item_controller.mm
index e13fc74eaaf8cc523511969320b68b900486eb5b..3c96766282afee066ca525f68d0df3c6a6e1d7f3 100644
--- a/chrome/browser/cocoa/download_item_controller.mm
+++ b/chrome/browser/cocoa/download_item_controller.mm
@@ -322,10 +322,10 @@ class DownloadShelfContextMenuMac : public DownloadShelfContextMenu {
 - (IBAction)discardDownload:(id)sender {
   UMA_HISTOGRAM_LONG_TIMES("clickjacking.discard_download",
                            base::Time::Now() - creationTime_);
-  if (bridge_->download_model()->download()->state() ==
-      DownloadItem::IN_PROGRESS)
-    bridge_->download_model()->download()->Cancel(true);
-  bridge_->download_model()->download()->Remove(true);
+  DownloadItem* download = bridge_->download_model()->download();
+  if (download->IsPartialDownload())
+    download->Cancel(true);
+  download->Remove(true);
   // WARNING: we are deleted at this point.  Don't access 'this'.
 }