Prevent web content from forging File entries in drag and drop.

Source/web/WebDragData.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 143 matching lines @@
     return WebString();
 }
 
 void WebDragData::setFilesystemId(const WebString& filesystemId)
 {
     // The ID is an opaque string, given by and validated by chromium port.
     ensureMutable();
     DraggedIsolatedFileSystem::provideTo(*m_private.get(), DraggedIsolatedFileSystem::supplementName(), DraggedIsolatedFileSystem::create(filesystemId));
 }
 
+void WebDragData::setFilenameForNavigation(const WebString& filename)
+{
+    ensureMutable();
+    m_private->setFilenameForNavigation(filename);
+}
+
 } // namespace blink