Allow dragging a download only after the download is complete.

chrome/browser/ui/gtk/custom_drag.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 "chrome/browser/ui/gtk/custom_drag.h"
 
 #include "base/file_path.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/gtk/bookmarks/bookmark_utils_gtk.h"
 #include "content/public/browser/download_item.h"
@@ skipping 71 matching lines @@
  private:
   // GClosureNotify handler for destroying a DragData object. |data| is assumed
   // to be a DragData*.
   static void OnDestroy(gpointer data, GClosure* closure);
 
   GURL url_;
   string16 display_name_;
 };
 
 DownloadItemDrag::DragData::DragData(const DownloadItem* item)
-    : url_(net::FilePathToFileURL(item->GetFullPath())),
+    : url_(net::FilePathToFileURL(item->GetTargetFilePath())),
       display_name_(item->GetFileNameToReportUser().LossyDisplayName()) {
+  DCHECK(item->IsComplete());
 }
 
 void DownloadItemDrag::DragData::OnDragDataGet(GtkWidget* widget,
                                                GdkDragContext* context,
                                                GtkSelectionData* selection_data,
                                                guint target_type,
                                                guint time) {
   ui::WriteURLWithName(selection_data, url_, display_name_, target_type);
 }
 
@@ skipping 77 matching lines @@
                                  guint target_type, guint time) {
   bookmark_utils::WriteBookmarksToSelection(nodes_, selection_data,
                                             target_type, profile_);
 }
 
 // static
 void BookmarkDrag::BeginDrag(Profile* profile,
                              const std::vector<const BookmarkNode*>& nodes) {
   new BookmarkDrag(profile, nodes);
 }