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This reverts commit b4426085.
Original commit cb8862fc.

Patchset 1 is a clean revert of the revert with all changes in
subsequent patchsets.

Only change from original is to skip logging attempt completions after
cancellation.  At that point, our NetLog reference should no longer be
trusted.

Bug: 859422
Change-Id: I39e2dcdf9e415f7f707411773627ab6015e45f57
TBR: isherman@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1124770Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572358}