Support dragging a virtual file out of the browser on Linux. This is based on the discussion of drag-out feature on whatwg: http://list.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-August/022122.html

BUG=none
TEST=To test, drag an element that adds the DownloadURL format data via event.DataTransfer.setData, to the desktop or a folder.

Review URL: http://codereview.chromium.org/600154

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@39405 0039d316-1c4b-4281-b951-d872f2087c98
8 files changed