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The tail end of libusb_submit_transfer assumes that the transfer object
is still valid. It may in fact have already been freed by the transfer
completion callback if that call occurs on a different thread. As a
simply workaround (since the libusb code will be going away soon) this
patch simply posts the transfer deletion back to the thread where
libusb_submit_transfer is called so that they are serialized.

BUG=487712

Review URL: https://codereview.chromium.org/1126203008

Cr-Commit-Position: refs/heads/master@{#329953}