Don't invoke AJAX failure callback on abort.
Don't invoke AJAX failure callback on abort.

We only abort to reset comet requests, and in those cases
we explicitly handle retries as successes rather than
failures.

lift/framework,lift/framework,sortable/framework,lzpfmh/framework-2,lzpfmh/framework-2,listatree/framework,sortable/framework,listatree/framework,lift/framework,listatree/framework,lzpfmh/framework-2,sortable/framework,lift/framework,lzpfmh/framework-2,sortable/framework,listatree/framework