GitLab

This change fixes a number of issues with sending bulk and interrupt
transfers to a USB device using the new Windows backend.

* Posting completion callbacks to the proper thread (a requirement for
  DevTools) has been fixed.
* Overlapped I/O results are now read using the correct method
  (WinUsb_GetOverlappedResult) and from the correct handle.
* Aborting transfers on handle close no longer results in a double-free.

Bug: 637404
Change-Id: I4fdb254e4ea6e9cbf7d764f588c94d698d61cb02
Reviewed-on: https://chromium-review.googlesource.com/c/1313828
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604827}